Product review (4 stars): Mounting holes do not come threaded.
PLEASE NOTE: The mounting holes must be tapped by using the old screws.

It's not hard to do - but don't be like me and assume the part you received was defective. I put the part together and went to put the screws in, but the holes were not threaded.  I sent it back, thinking I got a bad part, but the replacement was made the same way.  Just use a bit of elbow grease and the screws will self-thread into the holes.

Once installed, the part works well.