Jones Abrasive Waterjet Service ( JAWS ) 573-581-7303 Mexico, Mo.
Fred and Jared Jones are good guys to work with,they have cut copper gaskets for pulling tractors from 3cyl yanmar's to NTPA / PPL unlimited super stock tractors.
You can try Flatout Gaskets.. I think the site is flatoutgroup.com.. Should be a 404 in the 4320... If you ever have the liners out.. you can have the liners cut for O-rings...
Bryan