You may need a donor to get this part. I'm not sure I've seen this part produced, aftermarket, not even AMD offers it. Possibly because, given its location, it's well protected from rust and exposure, compared to other areas. I may need to take a closer look at my OEM roof, but I think you can install this part after the skin is in place. Meaning, if you cannot find one in the short term, you may be able to move ahead with bodywork until you DO find one. It doesn't seem to provide much support, and it's primary purpose my be the mounting point for the dome light.