Mazzolini Racing is the only "mopar speed shop" that I know of on the west coast. There are a few Dodge dealers who carry Mopar Performance parts but not too many of them stock aftermarket parts.

I'm on the west coast but I don't sell retail. Neither does Hoffman. Doctor Diff is in Montana which is the west coast for east coast guys. Cass carries some stuff but is mostly focused on rear ends and brakes.