Searched 8 lug Chevy rim .... an look for the style .... they are billet rims solid alum. not forges, cast or stamped. Start with a solid chunk of alum turn it on a lathe and then to a mill for slots N bevels.
https://inlandempire.craigslist.org/wto/d/moreno-valley-2006-chevy-8-lug-rims/6817551249.htmlhttps://www.ebay.com/itm/New-set-16...evy-Silverado-2500-3500-HD-/321412794893https://www.ebay.com/itm/4-New-16-wheels-rims-for-Chevrolet-Silverado-Duramax-2500-3500-Chevy-24001/272819454131?_trkparms=aid%3D555018%26algo%3DPL.SIM%26ao%3D1%26asc%3D55991%26meid%3D9967534140ad4766ba7f096b438e5c8e%26pid%3D100008%26rk%3D1%26rkt%3D12%26sd%3D321412794893%26itm%3D272819454131&_trksid=p2047675.c100008.m2219
One rim ...
https://www.ebay.com/itm/16-INCH-GMC-SIERRA-1500-2500-PICKUP-1999-2010-OEM-Factory-Alloy-Wheel-Rim-5079/192783832228?_trkparms=aid%3D555018%26algo%3DPL.SIM%26ao%3D1%26asc%3D55991%26meid%3D16082cd592bc4ab69968a8788d39e14b%26pid%3D100008%26rk%3D11%26rkt%3D12%26sd%3D272725447496%26itm%3D192783832228&_trksid=p2047675.c100008.m2219
https://forum.ih8mud.com/threads/stock-chevy-8-lug-rims.303438/https://www.ebay.com/itm/1-New-16-Wheel-Rim-for-Chevrolet-1999-2010-Suburban-2500-HD-Chevy-A1040/263601084311?_trkparms=aid%3D555018%26algo%3DPL.SIM%26ao%3D1%26asc%3D55991%26meid%3Db1652b55e41c4b27b228406f03252278%26pid%3D100008%26rk%3D4%26rkt%3D12%26sd%3D192783832228%26itm%3D263601084311&_trksid=p2047675.c100008.m2219
https://www.ebay.com/itm/Aluminum-Alloy-Wheel-Rim-16-Inch-00-07-Chevy-Silverado-GMC-Sierra-1500-2500-New/372451445733?_trkparms=aid%3D555018%26algo%3DPL.SIM%26ao%3D1%26asc%3D55991%26meid%3D43f5857842fd4b5993e0edcc0ef4bac6%26pid%3D100008%26rk%3D1%26rkt%3D12%26sd%3D263601084311%26itm%3D372451445733&_trksid=p2047675.c100008.m2219