The VC's come with the gasket on them from the factory, you will not find one aftermarket, nor will you find one from Jeep. They typically tell you to buy a new VC, since it has the gasket already on it.
Get some silicone gasket maker, I used the RED Hi-Temp one for mine. I did it the 1st time, waited an hour, then drive it, that was my problem. It leaked a little. The 2nd time I waited overnight, then it was good. You need to tighten the bolts on the VC in a criss-cross manner so the gasket seats correctly.
Good luck.