1951 Chassis Question

[Scott2]

I am taking my 1951 3100 apart in prep for reassembling on a new TCI chassis. After I pulled the bed off, I see two u-channels running side-to-side on the front and rear of the last rear crossmember. (see arrows on pic) I didn't see any connection to the bed so if I'm selling the chassis, do these go with it as part of the frame or do I need them on the new chassis for the bed mount? Yes, one of them is bent but doesn't change the question.

Thanks!
Scott