Made by Airhead Parts / KGPR. Keeps door from swinging out into fender. Also holds door in the open position. If you have metal straps, it’s only because the rubber that surrounds the metal has deteriorated. The shape of the rubber (see pics) passing through the rollers is what holds the door in the open position, even on a slant. Don’t forget 837-259 (pins, rollers, and clips)!
NOTE: Product is marked with “L” on one side and “R” on the other (Next to “KG” Logo). “R” up when installing on right side. “L” up for left.