Got a call from the guy who's welding our van telling me the panel we ordered from Just Kampers was too short (https://www.justkampers.com/251-809-159 ... -1992.html).
See pic:

That didn't sound right, so had a look online and is it correct I'd need to buy this as well? https://www.justkampers.com/outer-sill- ... -1992.html