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What size do you purchase?

It's easy, let's measure. 

(1) Measure from the ceiling to the garage door track bolts holes.

Or from the ceiling to the door opener attach bolts, 

For below ceiling installation.

(2) For mounting cleaner inside the ceiling measure the supports above the drywall and the drywall. Add that to the measurement.

(3) Now look at the chart to see the kit that fits in that number.

Kit numbers represent the max length for that kit.

Thunder Mounts Installation Chart
Thunder Mounts Connects
TM

In 2007, Thunder Mounts was recognized by Door Dealer Magazine as a new innovation for overhead garage doors and openers mounting systems.

Professional door dealer magazine 2007
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