Convertible Side Rails

Q: Convertible Side Rails

I need to replace my convertible top and found the frame at a junk yard. The siderails have the following codes stamped on it:

F P L and F P L

Is this correct for my Firebird?

A: On the outboard side of the Front Side Rail, there is an identification stamp:

F P R (or L)

I believe this to be “Firebird, Power, RH, LH”

(from my 1968 Firebird w/PwrTop)

A: In response to those letters being stamped into the siderails, wouldn’t “F” mean F-body? Firebird guys know the Firebird was the better car, but we do have all those cramos to scarf up some parts from!