One kinda major one in SoCal seems to be missing:

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TRE Motorsports, owned by Dave Bouzaglou, who is an Esses supporter and whose shop has turned out many Excellence magazine feature cars.

Good source for the following parts for the 1965-1973 and G series models.

Fiberglass shell based seats (the R, ST, RSR, etc)
Backdate and period fiberglass parts
Period roll bars
R to RSR reproduction parts
Repro trim, rubber, and lamps
Special graphics

Their website is somewhat out of date, but contact them and ask

www.tremotorsports.com or Dave at tremotorsports@gmail.com