Cab to bed Rubber Seal??

Anyone know where I can buy the seal so that when I cut the back of the cab out and the front of the bed out I can combine the 2? I am going to do this to my F150 so I can put a nice little system in the bed, after I bag it.

go to a rv place and get an acordian boot seal ,those seam to work the best and make sure you use a quick drying and good sealant inside it if not it will slip off

thats exaclty what i've heard too^^

Cool, thanks.