Not sure then what happened - am the 2nd owner knew the original owner - no changes I'm aware of to the car- 1972 SS with U (396) - Z27 - car came with split bumpers and white Z racing stripes no RS front nose - also didn't come with blacked out tail section which the SS was know for. 1972 was a strike year who knows what they through together just move inventory.The split bumpers where not available on all 72 Camaro's as an option. You had to get the RS package to get them. That being said, you could get an RS, an RS/Z28, or an RS/SS, which would all have them.
The bumpers will bolt up fine. FYI for all - the split bumper and the Z racing stripes were a available option for all 72 camaros, more so for the SS option - they were not not exclusive for RS or Z's. Wear your splits proud!!!!