The M-63-C is a weld in 10-32 threaded bushing with a shoulder. The tapped bushing is made from 1/2" RD 4130 steel and measures 0.310" O.D., length is 0.282", 3/8" flange diameter, and 1/8" flange thickness. 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.