belive it alot of diff makes used left hand studs from time to time,on some one side was rights and one lefts,idea being that they would self tighten under acceleration.for my self i always have put one lefty on each corner[stops thiefs cold,they can,t fig why it won't come lose and leave,instead of wasting time that might get them caught.   also on the vega, nice little car esp. the cosworth version,also worked well with a small block under the hood lots of diff kits around to make the swap[even g.m. put one out from the fatory(kit that is)]