I've got a Pendaliner on my 97 supercab. It's definitely short on the sides but it does go under the rail caps. There is another problem with my liner being a little short right before the tailgate. There's all kinds of areas that water and junk get trapped between the liner and bed. When I wash my truck I try to park it on a hill with the back of the truck facing downhill to help let the water drain out. Then I take compressed air and blow out as much as I can. I'll never buy a bedliner again. At work I have another truck with a spray in liner and it's the way to go. If I wasn't trying to save some money for other goodies for my truck I would pull out the bedliner and get a spray in right now.
Jim
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1997 F150 Lariat Racer4YSR's F150
SuperCab, Red w/ Gold, Styleside, 4.6L, A/T, A/C, 3.55 3800 Limited Slip, Class 3 Tow Package, Leather Captain Seats,Sliding Rear Window.
Modifications:
Airaid FIPK, Bugflector II, Viper 500ESP Alarm, Pendaliner Bedliner, Cobra Trapshooter 3 Radar Detector, CARR Tubular Nerf Bars, NFA 1400 Compact 55W=>85W Halogen O.E. Lights, Durango 255/70R16, Chrome eyelet tie downs, Smoked front lic. plate cover