This is a Delco AD244 Series Alternator for the 1999-On Chevrolet / GMC Light Trucks. This Unit Looks Like the Smaller 105A 10480388, But in a Larger Case Size. Bosch Also Makes a Similar Unit, Lester 13860, for the Suburban, When Assembled in Mexico. The Latest Version of the 8237 (#15750871) Uses a Stator That Has a 31.5mm Thick Stack, While the Earlier Versions Have a 27.5mm Stack. The DE and SRE Frames Differ, So as to Match the Stator.