Hot_Ajax, let's try to remove some confusion here ...
1) what kind of equipment is it? Generator, pressure washer, elephant scrubber???
I presume it's a whole house generator by the way you've described it, but it could be portable equipment?
2) What does your manual say for O/FCIs?
3) Is the piece of equipment still under warranty?
I suspect that huge hydraulic filter you found is NOT what you're needing. Likely, some equivilant of a small filter with a 3/4-16 thread, or perhaps a metric will be what you seek.
My dad has a Generac standby genny, and it has the v-twin GT990 motor. Generac makes all their motors in the household line, except for some really small motors they may buy. Overall, I think just about all the pressure-fed Generac engines typical of the unit you have use the same filter, and the Wix equivalent is the 51394. I suspect that's probably what you seek. The Wix site has a filter search for "off highway equipment" which includes a LONG list of Generac equipment; start there first. You can either search by "generator" or by "engine" category. Just about any criteria I put in for a 7kw genny, or with a single or small twin cyl engine, all come up with the same answer; Wix 51394. You can get that filter at many local places such as ORs, or the NG equal. Or, easily x-ref's into your favorite brand of filter. This is a pretty common little filter and should be easy for you to find for $4-6 bucks; feature dependent.
Wix does offer other filters, but they are for much larger generators than what you have. Most of the other offerings are for gennys with 25kw and above, and have four cylinder engines, large diesel engines, etc. That's not what you have; you have a small 7kw genny with likely a single clinder engine. All the household-type genny stuff takes the same Wix 51394.