Plastic interior pieces in early Barracudas

Bob Jasinski said
I've been putting off posting about this, but the time has come, the dreadful interior plastic pieces in the rear of the early Barracuda'sView attachment 1715508242
Mine cracked when disassembled 10 years ago, and I put all the parts in the bag. Can these be repaired? has anybody reproduced them? How about laying in fiberglass and fixing the broken parts? Would it melt the plastic? Fortunately, my fronts are OK.

I know what the 2 bigger pieces are on the bottom of the picture and am in the process of making a mold for that bigger piece. but what the heck are the 2 narrow pieces? and where do they go? anyone go a picture of them installed and out? I'd like to get a set that I can glue together to make molds from so I can re-produce those parts.