[njsteve]

Just about every Firebird had the retracting wiper setup standard, unless it was an ultra base model. So you may want to look at later Trans Ams 1970-81. The wiper motor itself changed in appearance after 74 or 75, I think. The early ones had the washer pump mounted on the wiper motor. The later ones had the pump mounted to the washer reservoir, itself, and as a result the wiper motor had a big flat section on its cover.