Looking for The Guy in Arizona with all the NOS items

There had been someone on this forum that had a large source of FMJ parts. Haven't found any mention of him on here this time around. Looking for a fuel sending unit for a late 1977 California car with ECS, the larger size.

Anyone know what the difference was between the larger 77-79 fuel sending unit & the 79-89 fuel sending unit?
Author: limedust70