Perhaps this filter would work? NAPA 3299 ... http://www.napaonline.com/napa/en/p/FIL3299 http://www.fleetfilter.com/filter/33299.html? http://www.napaonline.com/napa/en/p/FIL3299 http://www.audiclassiche.net/club/forum/viewthread.php?thread_id=3407&rowstart=60 I suspect it could also be used on the 4kQ. - - Dave C.