From Rotora? Perhaps. I purchased mine through Tundra Racing. I haven't been on Rotora's website in a while though.
What would be better is if you could get the 6 piston from Stop Tech. Better quality, upgradeable components, and a ton more support.
With the right bracket, you could easily have their 6 piston kit. If interested, this is who you need to talk to.
http://store.zeckhausen.com/catalog/index.php?cPath=24_212_511
That is also the link to my size rotors. I adapted the Stop Tech rotors to the Rotora hats. The Rotora rotors wore out very quickly and deformed at the pins, in such a fashion that was very unsafe. The hat, while bolted down, could literally move around. Whereas it is only supposed to be able to expand from heat, and not move side to side.
Also, just shipped out your old intake manifold yesterday. Been in my attic for a long time, and is now on its way to a new owner.