I am currently prepping my window apertures for paint following extensive repairs and I am told there are 2 types of window rubbers available one for the bus and one for van con versions. I am guessing the difference is in the width of the outer groove which will fit to either 1 or 2 thicknesses of metal? Is that the case? I would really like to see a x section of both so I can decide what might be best as my aperture edges do vary a bit in thickness due to the repair schemes. Also grateful for any tips on other differences and lubrication/sealant products to aid assembly. Thanks in anticipation LB experts.