Basically, Calipers, Pads, Rotors and special bushing to keep the 08 centered properly on the older hub. Here is a link I used last week to order a set made by a user on TT, name kia001. beautifully made, not just a piece of pipe cut with a hacksaw. I should see them her in a few days, they just shipped today.
rg500.com: Nissan Titan Rotor Spacers
I'm down to $120 each, for rebuilt Calipers from Federated Auto Parts. I plan on buying them in advance so I can paint them same time I do my PML Trans Pan and maybe my Water Pump too. can;t have too much Red accent can I?
There is a thread for the whole swap, with illustrations...