I have a unique situation. I already have a hole in the roof of my truck from a previous installed commercial redio antenna. Looking for a thru the roof hole mounted XM antenna. Many dealers dont want to talk to you when tring to buy someone else's product for use. I have a Ford F-350. Hole in center of roof. Or if someone knows of a Motorola NMO xm antenna that works.I wont have to replace the mount. Thanks for any response....Steve