Evening folks. I bought a pair of 110 side van panels for my camper build. I want to chop off the first 250mm so that the cab butts up to the camper box.

These side panels look a bit different to me. They have a piece behind the door pillar. Is this an additional bit for some special purpose? Can I just remove it or is it a totally different construction. I want to use the panels on a 2011 body.