This is the best steel reproduction core support on the market. It's based on the 73-77 core support but will work for all 66-77 V8 Broncos. The V8 part has to do with the radiator mounts which are V8 style and come pre-welded to the support. You will also notice the support has the power steering box area clearanced just like the stock support (73-77). It also has the 72-77 stock type cold air intake on the passenger side. Save time and money by starting with a better core support.