I googled and got many hits, so one of them probably answers your query. When it comes to true h/w problems, usually a well stocked local h/w shop is best. Modern big stores carry only typical or generic fixes which usually aren't all that good for the long haul. Sometimes the only available fix is to replace the whole unit or next assembly as a whole.
-OR- use parts from another location that's not as frequent use and swap parts, if applicable. You maybe lucky and have a local vendor that recycles used parts.
Since, here on the farm we make anything work, it may behoove you to tinker and come up with an answer that doesn't look pretty but does the job. If no adapter of such is available, then either arc welding, epoxy, or JB weld(product name) may suffice.