E9 Group - I began with my interior restoration by redoing the trim veneer, which so far has gone very well, not perfect but acceptable for a DIY. However on removing the rear wood tirm strip I noted a rusty panel behind the wood trim piece. In the photos, the lumpy appearance behind the vinyl unholstery is rust, and it is part of an interior panel. In general there is very little rust in this car otherwise. My question is how best to remove this panel and replace then is the part widely available. Or am I better off just going to an interior shop. Probably the best result would involve replacing the upholstery as well, something I probably could not do. Thanks in advance