Photo 1 of Chamberlain | Belt Drive Rail Extension Kit - Black - Hardware Included - 39 1/2-in L X 3-in W X 4-in D | Rona

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Photo 1 of Chamberlain | Belt Drive Rail Extension Kit - Black - Hardware Included - 39 1/2-in L X 3-in W X 4-in D | Rona Photo 2 of Chamberlain | Belt Drive Rail Extension Kit - Black - Hardware Included - 39 1/2-in L X 3-in W X 4-in D | Rona