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Help got a 1979 corvette can seen to find right part number for a a/c motor they keep giving me one but the wheel is to long it bottoms out can bolt it in any one know to right part number ?
Who is "they"? The AIM will list the original part number for the blower motor.
The C4 motors are essentially the same, but the fans flow more air. You can take the fan off your original motor and install it on the replacement, if you want to go that route.
I agree with Sixfooter. Make a spacer and use the C4 motor and fan.