Panelboard Gas Tank Cover

[Bootes]

I have a 70 Chevy C-10 pickup... there is a black/gray cardboard gas tank cover that can be seen between the seat and the door on the driver side. I note that it does not extend to the passenger side and insulation type material can been seen on pass side. I ordered a new one thinking it covers both sides but it turns out that it doesn't extend as far as the passenger side. I spoke to the Classic Chevy part place and they say there is no such item for the passenger side. Is this true? It appears to me that something was there or should be there (i.e. cover). Any info. on this would be greatly appreciated.. Thanks, Rick