Wow, I hadn't thought about them for decades. Are they even still around? If so then they should be a good resource.
Someone mentioned another well known Fiat specialty repair shop in SoCal (I won't name names). I have been hearing very poor things about that shop for several years now. Besides I've always felt their expertise was with 124's and not x1/9's. Personally I wouldn't recommend them but that's only my view.
Sadly there aren't too many options. I don't recall the names at the moment but there were two Fiat shops up toward the north side - around Pasadena or the valley I think? Although I believe they are no longer in business. Try asking Papa Tony (
@Black-Tooth) if he knows if they are still around. I never had any personal experience with either.