Sears openers are made by Chamberlain.

____Reply Separator_____

I thought they were made by Chamberlain Lift-Master.

A quick search at a garage door opener parts company showed the same parts fit
1984 thru current chain drive openers made by Liftmaster, Chamberlain, Sears
Craftsman, Wayne Dolton, Master Mechanic.
How's this possible unless they're all made by one company and sold under
different name?