For a temporary buy the above and then cut to fit, one should be enough the rest you can use in the unit.
Another option is a wad of aluminum foil stuffed in the holes, just be sure to remove them when moving the slide.
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2016 F350 6.7L LB CC Reese 28K 2014 Chaparral Lite 266sab
"Those who would give up essential Liberty, to purchase a little temporary Safety, deserve neither Liberty nor Safety." 2014 19 days camping 2015 17 days camping201620 days camping