Chuck,
Since your coupe was produced in late `72 the trap mirror was probably the mirror of choice at the factory. Sometime in `73 it appears that they switched to the flag mirror, my coupe was built in May of `73 and has the flags. I know that US 2002's in May of `73 were still getting trap mirrors, my friend Ray is an original owner of a Tii built in May. And I just saw an original owner `74 2002 with trap mirrors.
I think the trap mirror has a cleaner look to it, especially on a CSL with the forward mounting point.
Please add your coupe's VIN to our registry, it is the 15th 4 speed U.S. `73 manufactured.
Chris
Edit: All US/NA Market coupes used the trapezoid mirror. The flag mirror was introduced sometime in early 1975 on the 2002 and after US e9 model production ended. There is no Flag mirror in the Orange Parts book, only Trap and Electric.