I purchased a replacement antenna mast from IPD for my 2004 C70. When I installed it, somehow I lost the nut that holds the mast to the retracting unit and secures it all in the fender. Does anyone know where I can get a special nut like that so that I can complete the installation to my car? I'm open to new, used, purchasing an entire used antenna to get just the nut, etc. I have not found any local C70's in the salvage yards near here; other Volvo's don't have the same set-up; IPD doesn't have the nut; and a hardware store doesn't have a nut that will meet the need. I'd really appreciate any help. Thank you.