Air filter size???

Can someone tell me the part number for a Mopar Performance air filter element or a cross ref. number so I can replace my filter. Air filter is 12 3/4" and 2 3/4" high. The air filter assembly is Mopar Performance type. Summit sells the whole thing but can't give me the replacement filter or suggest a replacement. My filter is on a 273cid. 4 bbl edelbrock 600cfm.