Hi, thought I would give you my 02 cents
I had a revtek lift kit installed and it has the 1/4" alum. spacers that fit on top of the coils. The kit did not have the replacement studs and I called Revtek and they said that on 05 and newer that they were not needed and will not put them in on 05 and newer kits from now on. I watched when they were putting the kit together and the stud did not have much thread left, but had enough for a good bite on the 3 to 4 threads that were left, just not gobs of it left over like in stock form. Les Schwab here on the west coast is the one who put the kit together for me and they said that they dont usually change studs anyway.
If you have anymore questions feel free to ask.