A quick learner from Rhode Island says:
January 6, 2014
Vaughan Bassett part. Purchased parts about 5 years ago from Vaughan Bassett, part number on repair order is 960-002-401. Part is about 2" wide by 1.5" high.
Tom from SWISCO responded:
January 7, 2014
Check out our 32-081 and see if you think this is a possible match. Be sure to check out the video below to see how it's installed.