[Pat70Z]

Looks like Freddie is probably correct. I measured the spring perches center to center and they are 45 3/8 - the correct distance for a 1970 Camaro. But the numbers on the tube and the housing don't lie; they are from a 69 Camaro. It is not hard to imagine that sometime in the last 54 years someone swapped the axle into my car and re-located the spring perches. There is a lot of years of paint and such on the differential, but I imagine if I got into it I would find the original perch locations.