751-12870 oil filter, this filter measures 4.125" X 3.25 inches.
This filter uses adapter 751-10790 ( the adapter is what the filter screw onto).
Adapter 751-10790 measures approximately 5/8 inch across. The adapter is item #14 in the Lister Petter drawing.
Oil filter will be item #23 in the Lister Petter drawing.