I have a new set of LT235/85/16 tires in the garage. I intended to put them on my 3/4 ton Chevy before I sold it. Unfortunately they are mounted on factory 8 lug rims. I can't afford to swap the stock 6 lug spindles/axles for the 8 lug set up and all of the new aftermarket 16" rims are $600. Are there any GM factory 16" rims that will fit my stock 84 K5 ?