I'm not sure what you mean. It's pretty beefy plastic. Call up Mike at Hilbish and he'll talk to you about it, he knows more about that stuff than anyone else here. I'm pretty sure he'll just sell you the revised housing and a gasket though.
EDIT: I just noticed you had an SVT haha. OK, so my housing is just a beefy plastic. You still need the SVT one I think. They are weird and have some sort of plug on the bottom. But like I said, talk to Mike on the phone. He knows a lot about this stuff and is a very nice and helpful guy.
Yes, that is a banana in my pocket.
Dan - gump
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Wiregrass Region SCCA