SCP lists the plenums as may others, but they are not in stock or production. This is the only way you can buy a new MP plenum for your rectangle port blower. Yes, it's a direct fit and yes, it will work with your EGR although an adapter will be required. If MP doesn't have the adapters in stock, I do.
Charles would be the one to ask about pricing though.
I'd like to see instructions on removing the old EGR tube and replacing with the mp EGR adapter. I have two of these to do now ... I'd there a recommended gasket material?