Even for the rarer ones, they surely are the source. They even insist on changing hands with all vintage watch service!

Most of our excellent (indeed!) regulars who do service here - stritcly alphabetically: Abel, Jasper, Nic just to name the most famous - have or can get most parts I think.
Still even TH themselves in La Chaux de Fond seem to have run out of some specific models, e.g. for some Monaco's dials if I remember well a discussion over here.
Don't know anything about Camaro's and your specific model though.

Cheers,
Fabrizio