Welcome. The 3M headlight polish kit [the one that uses a power drill], works well on the headlights. I poster here recently did a great job using, I believe, the comparable drill-driven sylvania? kit, which may be a rebrand of the 3M. To tow 'heavy,' as in hauling an E36 on a trailer to the track, you will need an OEM tow kit. Very hard to come by. I posted a list in early December, from a search done by the helpful guys at Morristown, NJ BMW, and I doubt stocks have been refurbished since then. The OEM aux stereo input, giving you a 3.5mm input, is commonly available, on Amazon and via ECSTuning, I believe, among other sources. Search and you will find on the window fixes, etc. Congrats on joining us at a very civil and helpful enthusiasts website!

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2006 X5 3.0 6-spd w/Evo UUC ssk
sport/premium pkgs
born Valentine's Day, 2006.