gts inner fenders

Hey guy`s, I`m in the process of doing a full detail of the under side of my 69 gts 383 4spd car. I`m looking at a some what of a hack job where some one in the past had patched up the cut outs for previously used fenderwell headers. The car currently has the original exhaust manifolds and beings I`m this far into it I would like to make things right so I was wondering if a person could purchase patches for this beings so many cars were cut up in that location, thanks for any help, Bob.