Hi I know the 1 side with sliding door is slid over lip and screwed but the other side is it meant be welded Sent from my SM-G973F using Tapatalk
View attachment 103564 Mine was held in by threaded horizontal rod on sliding door side 19 There is a screw that went in the end
The rod thing is prototype bay. Your late bay won't have that. It should be a self tapper through a tab on the underside at each end of the cover into spire clips on corresponding tabs attached to the van body.