BMW Genuine Belt - A/C AC Climate Compressor 4K X 824-844 for 545i 550i 550i 645Ci 650i 650i 645Ci 650i 650i 745i 750i ALPINA B7 745Li 750Li 335d BMW Genuine Belt - A/C AC Climate Compressor 4K X 824-844 BMW Manufacturer Warranty: 12000 miles or 1 year Please see Product Description below for vehicle compatibility.