Fuel Filter Adapter With CAT 1R-0750 Filter 2007.5-2009 Dodge Cummins 6.7L XD391 XDPEnhance fuel filtration efficiency and serviceability in your 2007. 5 2009 Dodge 6. 7L Cummins with the XDP Fuel Filter Adapter With CAT 1R 0750 Filter XD391. The XDP Cat Filter Adapter features a CNC machined, billet aluminum filter head that is designed to replace the stock filter assembly. The new filter head is designed to accept the CAT 1R 0750 advanced high efficiency fuel filter to provide your Cummins engine with superior filtration and