Anyone know if Cummins sells a steel core intake plate/cover gasket? (12 valve) I see Haisley advertises one, I'm wondering if it's a Cummins piece or aftermarket. I know you can get steel core grid heater gaskets from Cummins, part number 3969988. I'm not sure if I'm naming them correctly as 'steel core'. They are the heat resistant type and the material looks like exhaust manifold gaskets I've replaced on old gasser Dodge's.