I found a solution for the NLA Rock Warrior center caps and it's a KMC wheel center cap T174K85-S2, I need to order some larger stickers but these worked to cover the KMC logo.
n0rth's Platinum build
It’s been awhile since I test fit that wheel from my Tacoma. I tried both 1.25” and 1.0”, due to the hub bore the 1.25 worked 1.0 did not. Stock studs worked fine ultimately I ended up running a set of Tundra/Sequoia 17’s with 1.25” spacers which should work with the wheels you have.
The Tundra seems to do fine with the stock 4.30 gears, they're load range D and weigh 73 lbs. Originally I was looking at the MT Baja boss in a 255/85r17 but went with the Kendas.
I'm running a set of Tundra steelies on my 40 with 1.5" spacers and it's worked pretty well for me. I've been following your build for quite a while and really dig your 40.
Kenda calls them 34.76" tall, I'll put a tape on them once they're mounted on the Rock Warrior wheels. I'm waiting on new shocks, shackles and bushings to show up.