Lots of options. Depends on what you want to do.

My personally, I like to maintain down-travel articulation so I don't lift the front much. Perhaps 880s are fine for you if you want some lift? Or you can get the "highland edition" coils. They are like stock but an 1" taller if I am not mistaken. Great if you want that oem ride vs a firmer ride.

I'm debating on trying some 1st Gen tundra trd coils on my tundra 5100s. I have 880s now and the ride is rough with these shocks to me. But rough to me may not be rough to you, vice versa.

Are you getting 4runner specific 5100s?

As for the rear, I personally would go well with the 890s. I had 906's but they were too short. With 890s and tundra 5100s my rear flex is crazy. (To me at least)

Also, make sure to extend the brake lines. Might as well flush the system when you swap the lines

Lately, change the front upper and lower ball joints if you have not already. Critical maintenance items!