Tail light gaskets, trust me. Have water entering trunk. Have resealed sail panels on both sides. I am now in process of replacing trunk seal, doubt this is problem, but signs of rust are showing up at sheet metal seams. Where does sunroof drain to in rear on e28? Water appears to be coming from the outboard side of deck lid hinge on driver side of vehicle. Yes, just below sail panel. May be a "do over" but thought I'd inquire here first. Thanks for any replies in advance, Mike p.s. if left out in rain long enough water will run into the rear footwell of cabin