I've got to replace the rearmost body bushings (#7, at trunk corner). I see everything but one specific to the 1966 Electra Convertible, as usual! (ClassicBuick.com has a full kit for $350, which seems wicked steep.) Will any 66 C body work, or a generic one? In any case, the floor pan bar is so rusted out I'll need to weld in a new one. Any sources for that pre-shaped would be nice too.