I just bought an OC 12 and it has rubber grousers. I would like to put steel ones on it and was wondering if anyone has ever found that grousers from another crawler were a close match. This tractor has an excellent undercarriage and I would like to put new, or near new grousers on it.  I may end up using ones with a  smaller bolt pattern and drill new holes to fit the OC 12. If anyone has any experience or ideas, I would appreciate it.