We had a tree fall across the power lines in the neighborhood the resulting power surge fried several things with transformers such as florescent light ballast the power supply for my dogs fence and these transformers for my garage door openers these worked great just as oem I was very glad not to have to replace the entire door opener you just unplug the opener
take the rear cover off find the transformer make note of which wire goes were drill out the rivets holding the old one replace with the new one using screws put the back on plug it up and your good to go
This was an exact match to a transformer in a Genie garage door opener. Saved me the cost of replacing it. It is only in service for a couple of weeks now, so no way of knowing longevity. But so far so good.