longer ubolts for 8&3/4

you're *probably* fine with stock 7 1/4 units or the 7 5/8" ones offered by mancini

hold on... i'll go measure some up to be sure for ya...

ETA: the ones i have here are 7 5/8" with 4" of thread, they will easily accommodate a shim and 1/4" plate. however i don't know what spring pack you're running. if it's 2" or less, then you're fine.