Solid mounting panel. Fits in lower wall opening behind driver. The outside surface is flush with the surrounding sheet metal. Material is expanded PVC that does not absorb water. We also have panels with boxes for these positions and boxes or solid panels for the rear section on a 170/170ext WB. See these in the accessories list. Please contact Hein at 541 49O 5O98 if you have questions.We are honored to help you with your van build. DISCLAIMER: Owner and/or installer assumes all risks associated with products and/or components purchased from DIYvan. Owner and/or installer recognizes and agrees that this product, and any of its component parts, is sold “as is” and that DIYvan makes no representation or warranty of merchantability that the product is fit for any particular purpose.