I had a Hurth HBW50, it failed and I replaced it with a PRM 60. Direct bolt in. I called Mike from Harbor Marine and he took me through the process and knows more about transmissions on the west coast then anyone else. 4-5 independent people from CA to WA all referred me to him. CAN'T SAY ENOUGH ABOUT HIS KNOWLEDGE OF CATALINA AND UNIVERSALS. I get nothing from the advertising of his services. I would call him and get the best recommendations for that boat and engine combo, he has them in stock and also that is where local people will order from is what Im told from the Hurth dealers in CA. Mine died at 600 hours. He told me it was a poor design, would cost more to rebuild, and there is a better design on the market. Rebuild cost, $1500-1600 with less then 500 hours expected versus $960 for knew bolt in PRM. I wish my little put put had a transmission cooler, if you can get one, might be worth upgrade. I did motor mounts, damper plate (or tried) and also transmission. If my engine was actually a Universal standard rig, it would have been much easier, but you can read about the process if you search for Hurth transmission in Catalina 30 forum. Also PYI has a superior damper plate for Universal then the stock one. I also got my mounts from them, seem good.