Can i reatin my stock 99ex coupe mounts for a 00 gsr motor swap, or do i need to buy a kit. If i need a kit what is a good one that will have the least vibrations?Thanks

stock has the least vibration

well can i use them for this swap??

no u can't use all the mounts...
ur going to need the mount by the timing belt from a 99-00 si..ths the rear mount from the 99-00 si..and ur gonna need a 99-00si tranny bracket as well...
also b series axles....