E Body vent knobs

I have seen square and round vent knobs listed for 71 E Bodies. My 71s have the square type. Were some round ones used late in the model year?

yes

Thanks. Do you know about what date?

I have a set in my 74 Challenger that I took out of a 4/71 build R/T Challenger and they are round.

Thanks. My car was build in May so they should be round.

My 71 challenger has round vent knobs and it is an early build (9/70) car

Quote:

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My 71 challenger has round vent knobs and it is an early build (9/70) car

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..same here..