Does anyone have a picture of the cross section of a roof J strip for ply headlining? If so could they: a - Give me the dimensions - rather than buy expensive ones I would like to try and source a cheap alternative! b - show a photo of where they are positioned on the van rail and the distance above the window openings they sit? Given up on the idea of a new headliner in my microbus and looking at the "westy" style 3 piece birch ply Cheers B