I've gutted my rear interior on my 65 fastback. I've taken everything out of the trunk. The sound is coming from somewhere in the vicinity of the passenger's side rear quarter. It sounds to me like its in the upper area (near the back of the louvers) or even from the corner of the trunk area/rear windshield area. It occurs on rough surfaces (like my gravel drive) and sounds like like a metal rod hitting sheetmetal. I've looked at the spring rod for the trunk lid, but can't find anything that would seem to cause this. I took all interior pieces off inside the back, nothing there. I even stuck my head in the trunk while they were out and looked up above the inner wheelwell and the roof quarter, nothing there but a wire (I'll isolate it tomorrow, just in case) but I can't find anything else. The inside of the ports for the rear shocks look empty. What am I missing? The exhaust system seems fine, the rear sway bar is tight, I am lost! Any tips would be MOST appreciated......