Tartan would not likely have the molds, the original C&C really started into bankruptcy when the production yard burnt, taking most of those molds and the buildings with it.
I don't believe Tartan acquired any of the original tooling with the purchase
of the rights to C&C, which is why they produced all new designs upon re-introducing the brand.
You'll either be going with someone like Foss Foam or another aftermarket producer. While their at it they might even be able to improve it a little.
The alternative is to copy a design from a similar sized boat and build one yourself, most C&C rudders were designed to have just enough rudder for the boat while trying to minimize drag, which means under certain circumstances you can lose lift