51 cab mounting questions

[Dustin_918]

Hey guys, I am looking for a little advice on mounting my new cab. The cab I purchased already had new custom built floorpans installed. They are not stock style so the do not have any of the factory mounting locations.

So basically I will have to engineer my own mounting locations. I know from the factory the rear of the cab has shackles but I do not care to go that direction. So would like to hear what some of you that do not have stock style mounting points have done. Thanks for the help.