Not only do I have the hardware, but there was also a nice Supreme Suspension keychain/bottle opener and looks like they included the spacers for the diff drop.
Heres my opinion.
If you're on a budget and your shocks are good and not leaking do the spacers.
If you have $350+ to spend do the 5100s. Regardless you will still need a rear spacer or new springs to lift the rear.
Truck has already been sold and had these parts leftover.
Supreme suspension 2.5" Leveling kit. Fits 4th and 5th gen 4Runner, 2003+ and Taco. Brand new. $50 shipped.
Cornfed Suspension 1" Rear lift spacer. Fits 4th Gen only. Will not fit 5th gen. (already tried it). $60 Shipped.
Buy both...
For sale 1" Cornfed suspension spacer for 4th gen 4runner. Does not fit the 5th gen, I've already tried.
$60 shipped to your door.
Here is a shot of them installed with Bilstein 5100 set @ 1.75" on my truck