Newold, Just as Don C posted this was no longer called a Boss. This was your last chance to order a true performance engine as the curtain was closing on the first generation Mustang. Just as on the 71 Boss, it was a solid lifter engine with no AC or AT available.
The 71 Boss hood paint treatment was unique and available only on the 71 Boss.
Since the 72 "R" HO was available in all model Mustangs, the Mach 1 would still receive the standard urethane front bumper and all other non Mach 1 Mustangs (except some special editions) would receive their standard chrome front bumper.