Many thanks for your replies. Dave, the pictures are just whats needed, I like the method you’ve used to recess the tracks. They actualy answer several other questions I had as well. Mike, my seats appear to be screwed direct into the recess in the bulk head, I don’t think it’s strong enough and I shall be changing it. There’s also no support under the center of the seat which, if used, would put excess strain on the mountings either end. Again I shall be changing this as per Daves pictures. Thanks all again.