In all of the pictures that I have been staring at recently, and they are quite a few, It looks to me like the COE seats use different "stands" on the driver's seat that go from the cab floor up to the slider assembly that the seat pan mounts to. I don't think it would be any huge hurdle but it might be something to keep an eye out for when gathering parts. by the way, big_dan_1950 on this site was reproducing those mounts as well as some other metal items for these seats. here is a link to some of his work.
http://s257.photobucket.com/albums/hh220/dans1950/54%20truck/?action=view¤t=DSC02129.jpg