I don't mean to be negative, but I wouldn't bother unless it is a Tbred B, even under high end phase on a top end socket A board, a Palomino would hardly do squat without vcore so high it would quickly turn to toast and a Tbred A wouldn't be much better.
For insulation, I just used a bunch of reasonably dense foam from a hardware store and a mix of cable ties and duck tape to hold it together. It's a bit ad hoc and doesn't look great, but it did the trick.
Good luck.