I have looked across the internet and found a lot of information spread throughout but nothing that was easy to follow.
THIS THREAD was the most helpful. (51 pages of information)
I am only trying to compile all necessary information to make the upgrade easier for everyone.

UPDATE:

Some people are still having issues with the calipers still seizing. This seems highly situational and I haven't taken the time to look for a pattern of causation.

I personally have had 0 issues and absolutely love the added stopping power. (Installed everything in March 2018 and it's currently Jan 2023)

This is a very easy upgrade caliper swap.
The mounts are identical and line up perfectly.
4th Gen Sport models (Sport Brakes Package optional on the Limited) have larger front calipers (13WH) and rotors than the SR5 models (13WG) so no modifications are necessary. The rear calipers/rotors are the same for all 4th Gens.
Yes, this upgrade DOES work on SR5 but the dust shield/covers need to be modified/cut or upgraded. (Just like the 3rd gen 4Runner -> Tundra caliper upgrade)
SR5 owners have the option of "upgrading" their brakes to the Sport brakes but these still have the seizing issues.


The 5th Gen calipers have shown less issues with seizing than the 4th gen calipers have. (my front left caliper seized which prompted this thread)
The 5th Gen front and rear caliper pistons are (2.5mm-3mm) larger than the 4th gens (not sure if this is compared to 13WH, 13WG or both)
The 5th Gen front rotors are 4mm thicker than the 4th Gen rotors. (this extra thickness helps with heat dissipation and warping)
The 5th Gen front rotors are the same diameter as the 4th Gen Sport (338mm or 13.307") (SR5 has 319.024mm or 12.56")

5th Gen Front Rotors:
Nominal Thickness: 31.8mm (1.25")
Minimum Thickness: 29mm (1.14")
4th Gen Front Rotors:
Nominal Rotor Thickness: 27.94mm (1.1")
Minimum Rotor Thickness: 25.908mm (1.02")

It is possible to use the larger (Sport) 4th Gen rotors with 5th Gen calipers...
The pistons in the calipers will over extend when the pads get warn down if you use the 4th Gen front rotors with the 5th Gen calipers. It is highly recommended to upgrade the rotors too
It is even less recommended to use the SR5 rotors with the 5th Gen calipers because of the smaller rotor diameter in addition to them being thinner.

5th Gen Rear Rotors:
Nominal Thickness: 18.034mm (0.71")
Minimum Thickness: 16.002mm (0.63")
Outside Diameter: 312.166mm (12.29")
4th Gen Rear Rotors:
Nominal Rotor Thickness: 18.034mm (0.71")
Minimum Rotor Thickness: 16.002mm (0.63")
Outside Diameter: 311.912mm (12.28")

Both 4th and 5th Gen rear rotors seem to work. Proofs:
5th: BlackWorksInc and measurements, Runn4est, JeffMerr, verman84
4th: 084RUNNAH,
The argument of why it might better to use 4th gen rotors: pjbrownva
ACDELCO 18A2735 (5th Gens) Center Hole Diameter 107.95 MM
ACDELCO 18A1227 (4th Gens) Center Hole Diameter 106.17 MM
That is the section of the rotor the emergency/parking brake uses like a drum brake (brake shoes press against the inside of the rotor)



Here are the other vehicles with the calipers we're after.
Front Calipers: 14WA

• LEXUS GX460 2010-2015
• TOYOTA 4RUNNER 2010-2015 (THEY CHANGED THE FRONT CALIPERS OF THE 5TH GENS STARTING IN 2016 which will not work)

Rear Calipers: F14 and braket 14B?

• LEXUS GX460 2010-2017
• LEXUS GX470 2003-2009
• TOYOTA 4RUNNER 2010-2017
• TOYOTA SEQUOIA 2001-2007

If you are debating whether or not to change the rears in addition to the fronts: Slowgoat here verman84 here M1911 here

When buying calipers, you'll usually have these options (source):

• Unloaded - Caliper
• Semi-Loaded - Caliper, caliper mounting bracket, hardware, no pads. (<-- Recommended)
• Loaded - Caliper, caliper mounting bracket, hardware (shims, sometimes bolts, rubber thingies, metal retainer thing), pads

Most calipers do not come 'finished' and will rust quickly. I highly recommend painting them, properly, if you do not buy them already painted.
JeffMerr and pjbrownva (with pictures)


Brake Pads:
4th Gen (Sport and Limited models) Have the same pads as the 5th Gen 4Runners (source1)(source2)


Wheels:
17" wheel recommended. Some aftermarket 16" work (like the FJ Cruiser TRD Pro 16s) but stock 4Runner 16" wheels will not. (source)


Brake Bleeding: (See Post #2 in this thread)
Brake Bleeding section of 4Runner repair manual. Link to PDF

I can't find any Speed Bleeders that claim to work on the 5th gen calipers. They may be different based on the (re)manufacturer.
Centric Front (141.44287 and 141.44288) Bleeder is 7mm x 1mm
Centric Rear (141.44587 and 141.44588) Bleeder is 10mm x 1mm
Duralast Front D6278 and Rear 19-B2737 calipers: 10mm x 1mm
Cardone(Wearever) Rear caliper Bleeder is 10mm x 1mm

Speed Bleeder(brand) (their website):
pjbrownva here ordered Front: SB7100-SS Rear: SB1010-SS Order Total: $70.00
DoctorMegaly uploaded a video on YouTube. He also used SB7100-SS for his front calipers (7mm x 1mm)

3/16" hose recommended for most nipples




My personal installation guide... (didn't have time to document, bought PWR-KC138-36 and stainless braided Front and Rear lines)
Let me know if I left out any helpful information and I'll add it to the original post.





USEFUL LINKS/THREADS

5th Gen Calipers by 084RUNNAH

Rockauto is a good place to order parts
(everyone has been able to get a refund for their core charge even though they returned a different model caliper) proof1 proof2 proof3 $15 return shipping?
Centric Calipers: (Cart Pic) Total [Before Core Fees: $188] [With Core Fees: $467.16]
Centric Rotors: (All Prices Pic) [Daily Driver Total: $186] [Heavy Duty Total: $298]

Eye candy (pictures) and part numbers from GLW68

5th Gen Caliper Install Gone Wrong? by fdbyrne

4th Gen Brake Upgrade Glock_19 by Ducmonsta

Rotors and brake pads recommendations? by Keyen702

Brakes need pumped twice to work correctly by buck_sez

Long but extremely educational video: Brake Replacement - A Focus on Brake Hardware