For 70-73 there was 2 style front ends, both of which split bumpers fit on, but a few different configurations that people often confuse. The RS option could be combined with a Z28 and most people think a Z28 has a full bumper, however, when the RS is added, the front end changes front standard with banana lights to the RS with the round lights.
The way I tell people is if it is an RS, it has Round Signal lights.
"Camaro Mike" of NY
Happily cruizin 7/31/09