Just found this on another forum
From: -- email address removed --
Sent: Jul 26, 2007 1:02 PM
To: XXXXX@XXXXXXXXX
Subject: Fw: Venturi Combo Filters
Tony, we do offer the LF9028 that is designed for the ISB Cummins engines, for Kubota and Carrier(OEM). Dodge has not ask for a Venture Combo for the pick up truck applications. However, the length and OD is very close on the LF3972 and the LF9028, so there should not be a issue on the size of the LF9028. The LF9028 should perform on the ISB engines in the Dodge Rams a they do on the Kubota and Carrier applications. However, Dodge may not cover the warranty on the LF9028, since they did not approve the use of this filter.
If I can be of assistance, please feel free to contact me.