Yep, Coors is right Keith. Companies such as Airfix and Revell used to include a slip in the kit boxes for requesting damaged or missing parts, now you can do it on-line. Might take a week or two, but worth it. If you can't get a replacement, or can't find a vac form one, let me know, and I'll see if I can mould one to fit. It should be the same size as my Boston canopy, so I can make the male mould and test-fit on my kit.
EDIT: Ooops! Forgot to say, it looks the dog's b*ll*cks with the weathering etc, great job mate!