in the late '70's, for a short period of time, I ran 8" Corvette wheels and F60 BFG tires on my '69 Z28..
I purchased new 8" wheels and trim rings from Chevrolet (local dealer in Huntsville, AL). The trim rings I purchased were/are the 4-clip design, same as the earlier wheels, and same as which were on my Z28!
If these type of trim rings were deemed unsafe for 6", and 7" wide wheels, WHY weren't they also recalled (and NOT sold anew) for the 8" Corvette wheels??? (Note, I still have those 'almost new' Corvette trim rings, in the original boxes they were in when purchased). Since the fronts scrubbed my inner fenders and actually damaged one of my wheel lip mouldings on my '69 Z28., the 8" wheels came off pretty soon after installing them; I put the 8" trim rings back in their original boxes and kept them.. I probably have the receipt somewhere for when I purchased them in the late '70's...