nichenson wrote: As for the rear BBS wheels, they pop up on eBay from time to time.
Calvin Sallee (his forum name is "chaparral2k" on F1M and other race car modeling forums) has resin BBS wheels for Porsche 962's, available for purchase from his HobbiTime web shop at https://hobbitime.myshopify.com/products/1-24-porsche-962-resin-bbs-wheels-set-of-4-imsa-935-le-mans-sportscar. He does often list these and his other products on eBay, but it's usually much better and cheaper to contact him directly (email or PM) or order through his web site than buying through eBay.
He also has a resin conversion set to convert the Hasegawa/Revell 962 into an IMSA 962. The BBS wheels (plus tires) are also included in this conversion set.
As Calvin says on his site, his resin castings often need a fair bit of cleanup and a bit of filling, but he gets the shapes right, his prices are very reasonable, he offers kits/transkits/parts not available elsewhere, and his service with shipping orders is top-notch! And he's a nice guy to deal with.