If you are referring to the weather flaps at the back corners of the bed, the best way to fill the holes is to do the cold weather adder. Purchase two swim noodles or two pieces of foam pipe insulation and cut them to length to fit under the bed slides at the side of the bed. This will seal the holes and insulate the bed/wall juncture. Search for cold weather threads for more info.
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Mike Laupp
2013 Jayco Eagle Premier 351RLTS 5er - Honda 2000i x2 w ext. run tank
2017 F350 King Ranch ultimate CCLB SRW 6.7L V8 TD Fx4 BakFlip F1 & BakBox
TM History: '97 2720, '02 2720SL, '03 2720SL, '04 3326K. 2001 - 2012 yrs owned.
1990 Isuzu Trooper II 283 V6
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