the HX31537 filter fits with Caterpillar Equipment
the HX31534 filter fits with Caterpillar Equipment
the HX31525 filter fits with
the HX31506 filter fits with Broyt Excavators; Poclain, Volvo Loaders
the HX31480 filter fits with Komatsu Equipment
the HX31478 filter fits with Fai, Komatsu Equipment