Need 1973 Duster Front Bumper Measurement

73/74 are identical bumpers. 75/76 are the same dimensions, but have different mounting holes

Thanks.

The 74 front bumpers seem to stick out front further from the car than on the 73s. I'm hopeful that I can change to the 73 bumper brackets and remove the steel brace to tuck the non-shock bumper in on my 74.