If you're a serious Gulf GT40 enthusiast this might be of interest: Ebay item # 124247357762. A full set of mint condition MAGNESIUM BRM wheels & NEW OLD STOCK Firestone tires for a Gulf GT40 (a $10 million to $35 million car).
Wow. Super cool!
seems cheap to me.
https://www.ebay.com/itm/Gulf-GT40-BRM-wheels-NOS-Firestone-tires-original-JWAE-Superformance-Ford-LeMans/124247357762?hash=item1cedb83942:g:7ZYAAOSwocFe5Nwp
Thanks for the link.