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on a guess i'd say it has something to do with the two peice rear bumper. looking at your pic it looks like you have a one piece bumper. i've got one on mine from someone changing it somewhere down the line. if so i bet you could order '75 lights and they'd fit. if it's an electrical difference i don't know.
Does anyone really prefer those bubble lights anyway? I never particularly liked them. But that's just me . I like my 74 lights (and my split bumper :p:)