As part of my Tundra Brake Upgrade research, I've had to seek out replacement wheels since my split spokes won't fit. I'm sure others are doing the same thing in order to avoid spacers/hub adapters.
Online searches often come up with wheels without the center caps, which make it harder to get the complete parts inventory since it's difficult to know what the exact center cap looks like and what the part number is if we have to order it.
I'd like to suggest we have T4R owners who have the OEM wheels with center caps that do fit the 231mm calipers without spacers post up a pic of their wheels + center cap along with the part number off the back of their center cap (if available) so that others who need to replace their wheels can get the wheel and center cap parts through online used or dealership orders. Even if there are no parts numbers listed on the back, having a pic of the center cap associated with the wheel should be helpful.
Note: this should be for only those folks who have already done the TBU or are definitively using wheels that meet the compatibility for the 231mm calipers.
As a reference, BFAD's much referenced post on the TBU (Post #3 for compatible wheels discussion start):
Hard to find Specs, Info & Measurements on 231mm 13WL Tundra Calipers & Rotors
Hope this is helpful.
i ground the caliper to match these factory rims. Can't complain at all. 
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