[bigblock73]

The rear piece slides over clips that are attached to the back of the cab itself, the side pieces then go on, are are bolted on from inside the cab.

It will not be real easy to install the rear clips, as there were studs welded to the back of the cab that the plastic clips attached to.

I suggest going to a JY, and taking apart a truck that has this setup...to determine if this is something you can do, or still want to do.