The key blank codes B45 and S1098H are used for a wide range of older General Motors (GM) vehicles. This key is most commonly the door and trunk key (or the secondary/accessory key) for many GM models produced from the late 1970s up to the early 2000s. It's sometimes known as the "H" keyway, as many original keys had an "H" stamped on the shaft. Primary Manufacturers and Models Because GM is a large corporation, this key fits vehicles across all their classic brands: Buick (e.g., Century, LeSabre, Park Avenue, Roadmaster) Cadillac (e.g., Deville, Eldorado, Fleetwood, Seville) Chevrolet (e.g., Camaro, Corvette, Impala, Caprice, Blazer, S-10 Pickup, Cavalier) GMC (e.g., Jimmy, S-15, Topkick) Oldsmobile (e.g., Eighty-Eight, Cutlass Supreme, Bravada) Pontiac (e.g., Bonneville, Firebird/Trans Am, Grand Am, Grand Prix) Common Year Range The most prevalent applications fall within the years 1991 through 1996, though applications can extend from the 1970s up to the early 2000s depending on the specific model. In summary, the B45 / S1098H key is a multi-brand General Motors (GM) mechanical key blank for the door, trunk, and glovebox locks of numerous cars and trucks from the 1970s?2000s.