Perfect fit for my very old screw drive GENIE. My unit was not listed as one that it would fit, but it was an exact replacement (Model GXL9550 1/2 HP). It was very simple to install and the price was great. It took a total of 5 minutes. I was extremely happy to find it on Amazon. I had visions of calling someone to have it fixed and to find the part, and ending up with a large bill. I appreciate that GENIE has kept parts that work still available.