At last, I have all the parts in my shop. I picked up the transmission today. Syncros were impossible to find and they were not the problem. It was a needle bearing between the input shaft and the main shaft that misbehaved. My guess was this was caused by low oil level. I have a new clutch disk, motor mounts, bolts and lock nuts for the drive shaft, and new red silicone hoses, also lower gaskets have been refreshed, it's time to reassemble.