strainer

This is the one that I have on the boat currently for the AC and the engine (1 each). Boatyard is saying should replace the bowls. Coincidentally, insurance surveyor told me to upgrade the whole thing. Anyone put in a different strainer or a different bowl from the standard Hunter install...

I recently purchased a Hunter 34 with a Yanmar 3gm30f engine. The Perko raw water strainer is an old one. The gasket is worn out and leaking. I had rather find a new gasket than contort myself in there to replace the whole thing. Any ideas as to a source for these?