Both Patrick's and M&T have ring and pinion sets available. However M&T does not sell the installation kit. I could be wrong but I believe Patrick's is one that developed the the r&p system and kit. However currnetly there are no oakey bushings available anywhere in the country. I have been working with Patrick's and I know this for a fact. And if you buy the r&p set w/installation kit Patrick's would be the best guy to help you if a have a problem or question. Sometime the service is worth more than the couple of bucks you might save.
