lower ball joint bolt for fmj spindles to a body ball joint

i need a bolt for the lower ball joint to the spindle i have bolts that came with the donor parts butt they are to short i know its sunday and i'm probly fd for the day. the bolts i have are 5/8 x 2" and they are flush with the back of the ball joint when pushed thru no room for a nut. where can i get these bolts..please the sooner response the better i only have 1 day off a week and want to get her back on the ground. i am using 73 lower ball joints and fmj spindles