Thanks, I knew SPD but had a brain fade when reading.
I was asking b/c when I was looking for bows last year some places (don't recall which ones) stated that '71s could be four or five bow. What you're saying makes sense but doesn't really answer my question. I know Ma Mopar used parts until they were gone before using new model year parts.
Just trying to see if anyone knows the approximate changeover date, not the build date.