I've put these on ebay. The primary filters are large and have a water separator and drain. I used an aftermarket filter head and mount them between each fuel tank and my facet pump.

Primary filters with water separator and drain
http://www.ebay.com/itm/181994664271?ssPageName=STRK:MESELX:IT&_trksid=p3984.m1555.l2649
http://www.ebay.com/itm/181989091143?ssPageName=STRK:MESELX:IT&_trksid=p3984.m1555.l2649

Secondary 6 micron filters for 6.9L
http://www.ebay.com/itm/181986516442?ssPageName=STRK:MESELX:IT&_trksid=p3984.m1555.l2649 (Purolator)
http://www.ebay.com/itm/181986506087?ssPageName=STRK:MESELX:IT&_trksid=p3984.m1555.l2649
(Baldwin)

Most of these are still wrapped in the OEM plastic or have been stored in large baggies since purchase.