Does anyone have any suggestion for finding a moderately priced (less than $500) canopy for an 83 Flareside? The Bed Dimensions are 83" x 63".

I've had a really tough time finding something that will fit, and be in my price range.

Is there a flareside owner that has mounted a wider canopy on this box? Any suggestions about doing that?

 

Is that the inside dimensions for the box? I have a 1982 stepside canopy. The inside mounting dimensions are 57" x 79". I'm probably about 150mls away but I was looking for $300. It's aluminum, looks like new.