Having not been able to source closure specific to 7/8 corrugated, I thought I'd give this a try. However, even though the height of the foam exceeds the corrugation height, the act of securing it pulls at the foam at the edges of each corrugation such that there is a bit of a gap (1/16" - 1/8"). Not really the fault of the foam or seller, just though I'd mention it for others. Product shipped quickly and is as advertised.