Worm gear for the Overhead Door model #456, 551 and 556 garage door openers.
Part #: 108608-0001, 108608, 108608.0001, 108608.1, 108608-1
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The parts I ordered were an exact fit at a reasonable price. Good parts availability adds to the value of Overhead Door products. I replaced both gears even though the worm gear looked fine.
The gear worm was slightly difficult to replace due to the limited space in the model 551. Although it was a bit tough to replace, the service provided was great and the delivery was prompt.