MST3K, The Tundra rotors are significantly thicker than the Tacoma or 4Runner rotors but are pretty much identical in diameter I believe. I sourced my rotors from autoanything, and I generally get my calipers from NAPA. My preference is that or OEM for the calipers.
I have been reading and one thing to remember is that there are two Tundra calipers. 199mm(13WE) and 231mm(13WL). Both use the same rotor, but the 231s have larger pistons and pads, BUT they are considerably larger overall and you will have to be careful what wheels that you run with them.
For my purposes I think the 199s will suit me just fine and I do not want to grind the calipers and REFUSE to grind on a wheel, and since I am running the split 3's and would like to continue to, the 231s are out without a spacer and if I am going to run the IFS hubs for width, then why would I want to add a spacer to clear a caliper.
I am sourcing some IFS hubs to have turned down to fit inside the tundra rotors. I am trying to get a parts list together for this right now. I will definitely post details up, or may start a new thread to document the parts and the process.