I've ended up with three different carb spacers, all are new and never installed. 1 open phenolic for a 4150 3/4 inch thick/ new $25 sell $15 1 open poly for a 4500 Jegs PN555-15436 with studs/ new $35 sell $25 neither of the above is in their original box 1 Wilson tapered spacer pn004150 2inch in original box/ new $197 sell $175 Postage to U.S. only, $5 Priority Thanks, David