the pre 90 spec cars, the ones with the cover on the ecu slot, had different shaped radios and lower trays than the later double (single) din upper and lower dashboards

if i can find some i'll take some pics of them, but i'm sure if you look through the different pics you've taken over the decades you'll find an inside shot showing what i mean

can't find any images via google so i can't show you what i mean