Dash air heat exchanger cover 90SP36

[williamcharrison]

I recently had my defective cb antenna replaced and the goon who
did the work must have sat on the dash air unit cover and broke it.
I didn't notice it until I was zooming down rte 75 and heard a loud
bang and watched the disintegrated cover fly off to the side of the
road.
Any ideas as to where to get another cover or how to make a useful
replacement?

Chuck Harrison
Akron, Ohio
90WLSP36