My car originally came with a California Customs sunroof as well.
When I redid the car in 2017, I was not sure. I did install a new Sunroof. It is a Webasto. A 321M, which is an electric sunroof. It required filling in the roof section by about 3", because it was slightly shallower depthwise than the original.
I attached a photo.
It works fine, but my car also has ac, so the sunroof is not needed for ventilation.
In retrospect, I would not fit a sunroof. It is noisy and smelly. Sometimes that is good, but generally not.
I attached a photo for reference. It fit pretty darn well and I think it looks nice. It does not leak, so it is not a problem.