So this appears to me to be home made. With 1969 backer board, or 1968 backer board with 1969 steel top attached due to the 1969 door lock location vs the 68 that is 8" aft of this panels. It has 1968 standard molded vinyl, top flat vinyl and stainless trim. It has the factory split vinyl joint between flat and molded vinyl beneath the top horizontal stainless trim. Someone added surged carpet to a standard interior panel the bottom, (or it is a Firebird panel?). I have seen carpet added to bottom of standard door panels to hide damaged backer boards. The round speaker extreme rearward location could be due to damage at the forward backer board that no longer had the structural integrity to mount the speaker forward in the location most often choosen. Common problem with older panels that have been mishandled during removal (note on below mine 2 of the forward clip mounting locations showing on the vinyl from a PO man handling the panel).
Look closely at 68 2 pc vinyl joint at ends of top stainless trim. This joint can be seen on OP's pic at forward edge, but pic is cropped at rear edge so you can't see entire panel.
68 standard panel I replaced the top 6" of vinyl at the factory overlap joint. Note correct 68 door lock location & 2 damaged clip holes in backerboard at forward edge.
1969 had a unique one year only molded vinyl design, the OP's panel appears to be 68 standard vinyl. Why someone would go to this trouble, maybe they used what they had to create a usable door panel?