Product review (5 stars): Perfect fit on Sub Zero 501F
I purchased this motor to replace a defective OEM motor which lasted 20 years in my 1996 model 501F freezer.  The motor came in 2 days and fit perfectly on the little A frame mount that the OEM motor was mounted on.  I had the most trouble getting the A frame mount out of the Compressor tray. I had to remove the bottom front plate and get a short Phillips screwdriver under the mount to unscrew the screws. One of the screws stripped out so I had to use a Dremel tool to grind off the head and remove the mount.  I replaced the 4 mounting screws with allen head screws which will come out much easier.  The mounting hardware provided with the motor included a new rubber isolator which goes between the fan and motor mount, 4 new mounting screws, 2 wire nuts which were too big for the #18 wire on the motor so I used 2 blue wire nuts which fit perfectly. There is some extra hardware for different type of mounts which I did not use.

In order to slide the motor assembly out of the tray I had to loosen and remove one screw on the compressor run capacitor which was in the way, otherwise it came out OK. The motor wires came with pins to plug into a molex connector (supplied), but my freezer did not have a molex connector just 1/4" slide-on terminals so I cut the wire and used the blue wire nuts to join the wires.

Overall I am very happy with the installation and parts, but we'll wait a few years and see if the Chinese motor can hold up.

My motor now runs at 1550 RPM and is slightly noisier, but not a problem in the kitchen.