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Chamberlain PD612EV 1/2 HP MyQ Enabled Chain Drive Garage Door Opener Parts
These parts also fit the HD420EV model, except Light Lens (C5) and Cover (C9)
Part Number:7710CB 10 Foot (3 m) Rail Extension
Chamberlain 7710CB 10-Foot Chain Drive Extension Kit
Please check with Chamberlain Customer Support in case of any doubt regarding the required replacement part. You can get replacement parts, Support Videos and instruction manuals on the Chamberlain website.