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I know about the pre-77 tanks. What I mean is there are also 2 types of 77-89 tanks as well. It isn't a big difference, but one type has a hump that sits about 1" off the surface of the top of tank. You have to beat it flat or modify the trunk floor if you want to move tank over the 1 notch.



I just checked the 77 Volare wagon and 79 Aspen coupe tanks I have out back and both have the raised area you pictured. Different sending units though, 77 is single wire, 79 is 2 wire.