A factory 67 Carter AFB would have a 4-7/8" horn. In 1968 the AVS went to 5-1/8". Post a picture of the top and bottom, the only way to confirm what you have. wave

The funny thing about science is that if you change one miniscule parameter you change the entire outcome to the way you want it.

JB Rhinehart, Realist

A-Body's RULE!