Glenn spotted this replacement spare tire oak block isolation kit on eBay
“This is a brand new Willys spare tire oak block isolation kit. These are correct in every way and very high quality, will fit Jeep CJ2a CJ3a CJ3b with 15 inch wheels. These mount between the body and the spare tire. We do sell the correct block for 16 inch wheels. These are hand made in a professional shop with the highest standards. The correct mounting hardware is included. They are excellent quality, Made In USA.”