I'm looking into buying a Weatherguard saddle box for my truck because supposedly that's the best toolbox to get. Their website isn't very clear on which models will fit my truck, 2010 F150 Screw with a 5.5 ft bed. I've called them multiple times and had someone else call. Each time the person that answers the phone gives a different answer as to which models will fit my truck. I've also filled out their form online twice so they could email an answer (once today and once a couple weeks ago). I have yet to receive an email back so not sure if my first request went through so I tried again today. In order to get a Weatherguard toolbox I have to get a shop around me to order one because none of them (that I've been able to find) carry the toolbox (model #121 or 127) in stock. This is going to cost me around $700, and the shops wouldn't be too happy if I asked them to order it and then didn't buy it because it wouldn't fit. I would like to get the Model 121-0-01 for my truck, but there seems to be major discrepancies of whether it will fit my truck or not. Can anyone please tell me if the 121 model will fit my truck? Also, does anybody else have a Weatherguard toolbox?