The M-232 Wingstand bushing is recessed to allow the bolt and nut to be flush with the outside wingstand mainstrut tubing. Use M-237 bolt and M-1034 nut to mount. 4 bushings and 2 bolts are required per wingstand. The bushing is made from 3/4" RD 4130 steel and measures 3/8" I.D., 3/4" O.D., length is 0.585", 0.625" counter bore diameter, and 0.440 counter bore depth. There is a pdf chart that can be downloaded from our website, http://mckinneycorp.com/downloads/pdf/bushing.pdf, that will give you a list of some of the bushings that we carry. Should you not be able to find the bushing that you're looking for, call and we'll be happy to assist you in finding what you need.