well i guess the usual suspects S+S rimmers etc or try your local uphostery company who may be able to cut foam to match or better.
[8 whole cylinders worth of punch to ram the world through the windshield and out the rear view mirror. Car & Driver]
1981 Grinnall TR7 v8
1981 Black FHC
1979 & 1980 Black Premium FHC(laid to rest) Sorry