I suppose we could fabricate one but it seems a lot of work.
Ideas welcomed.
Rethinking here, I wonder if it would be possible/feasible to disassemble it, press it out, straight/flat, scribe another replacement onto a piece of flat aluminum, form it up in a metal brake, reattach new baffle seals and make it an "owner produced part?" Seems it's got to be cheaper than $500+dollars for the OEM replacement?$?$?$
Then again, most '71-'77 models I've looked at seem to be missing that piece.