Yeah, these spacers are VERY IMPORTANT and must be perfect in size, you will need a micometer to measyre the distance between the bearing and the case. If it is wrong, say hellow to another blown tranny with shiney new parts.
Good luck, I started out with a $250 job, it is now over $1,000.
I need, new Input shaft and GVR4 gear (My choice) new 1/2-3/4 hub and sleeve (didn't know on the 1/2, a $120 dollar surprise) new reverse gear (anouther $urpri$e) all new snap rings, magnet, seals, and a phantom Grip LSD for shits and giggles, it adds up fast.
Good luck. with my Cluitch and flywheel I have spend $1500 all together, but this includes the labor and custome work soooooo..........