i bought a receiver hitch attachment to fit my imatch. it has cat one pins on the bottom. i bought some bushings just like i have used on other attachments, its the ones that attach with roll pins and have a shoulder on them. looks like the overall width of the attachment is too narrow and the shoulders on the bushing is hitting imatch. is there a one piece threaded pin i can purchase to make this fit? appears to be about a 3/4" thread. i can check it later to be sure.