Description Fleetguard LF777 is a lube, by-pass spin-on oil filter with 1 3/8-16 UNS-2B thread, 249.2 mm overall height and 116.08 mm largest outside diameter for heavy-duty diesel lubrication systems. It is used on selected Cummins engines with OEM references 3021658 and 3889311 and in applications on Caterpillar, GMC and other on- and off-highway equipment. Equivalent and cross-reference filters include Baldwin B7575/B7577, Donaldson LFP55-0777/P550777, Ryco Z233, WIX 51681 and NAPA 1681.