Replacement ignition key Compare your key with that shown Note this key is cut on both sides. Cross-sections show the hole key will fit into Keys are sent as blanks and can be cut to fit your car at any local key shop for a nominal charge. Check to make sure your blank key fits into ignition before cutting. Click on line drawing for photo of key. Uncut key shaft measures 8.51mm x 26.60mm For: BMW 1985-92 3, 5, 6 and 7 series Original codes ran from: HB10001-HB49999 Cross referenced as: Ilco #: BMW3, X144 Curtis #: BMW3 Taylor #: X144 Silca #: HU50