Summit, Jegs, or any other speed-shop will have a dozen or more options. One-piece covers, two-piece covers, covers with removable plates for accessing the camshaft...there's no limit to the variety offered. Some will be quality items, most will be Communist Crap. Be aware that GM has used various positions for timing pointers, the timing pointer must match the damper you use, AND be accessible (seen with timing light) with the engine and accessories installed in the vehicle. "I" would--and did--use the stock stamped-steel cover, with a fresh gasket and front seal, because there's NOTHING wrong with it unless it's warped or has a hole worn in it, and you know it fits and will work properly.