Hi Mike.....
Kind of depends on you. If you are wanting OEM you are going to have to do some research for that. Mabe your local Chevrolet garage can help.
If you wanting OEM like fit then one of the Corvette parts suppliers close to you would work. (Close to you to keep shipping charges down.)
They all sell similar and reliable products that they stand behind.
If your not wanting to do the work then maybe a local custom work shop would be the answer.
It depends on what is a value for you. As far as patching the exisiting system to me that would be a waste of money. If it is bad now it won't get any better until replaced. Since the car isn't a daily driver it can sit until the funds become available to do it right.
Take the money for the patch kit and apply it to a system you will be happy with.
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