- I highly recommend cust to not let her handyman touch this door ever again- he has completely boxed in the gdo head and also installed a screen around the door opening rubbing back I l made him take it down or i would not work on door- low headroom top section is very delicate when adjust top FIXER to get door to close and seal properly- handyman also installed new bottom seal and retainer that I had to cut off because it was 1 inch too long protruding into track rubbing making horrible sounds- Overhead door all 18" sections required 6 rollers per side vs standard 21" requires 5 per side so this door takes a total amount of 12 rollers - 10 in a pack then 2 at 17.60 per rollers-