Buick Lacrosse OE Wiring Harnesses & Stereo Adapters We carry Buick Lacrosse wire harnesses that have a common style with black or white connectors on each end, covered in certain areas by a special type of tape or sleeve, as well as harnesses that have a sleeve along the entire length. buick lacrosse harness | eBay Find great deals on eBay for buick lacrosse harness. Shop with confidence. Skip to main content. eBay Logo: Shop by category. Shop by category. Enter your search keyword GM Car Stereo Radio Installation Install Wiring Harness Interface Bose + Onstar (Fits: Buick LaCrosse) Brand New.