I bought this one from Amazon $10 with free shipping for Prime¹ members (I have seen some for $8 but w/o free shipping)---it is identical to the OEM filter I took off. Tractor supply actually does have one, but they don't know it 'cause it's labeled as being for a Cub Cadet lawn tractor or something. I think it's $11 or $12 though.
No sensible, cost-conscious manufacturer (which the Asians certainly are) would develop and commission a proprietary oil filter when they can just grab one off a shelf somewhere--only Apple would do something like that--Oh, wait a minute I said "cost-conscious"...Apple doesn't give a crap about cost because their customers will pay whatever they ask.
As far as I can tell most Asian made ATVs and UTVs use this same filter.
FWIW, my Ariens 20 HP tractor with a B&S Instek motor uses a variant of the same filter (same base, but 3/8" or so shorter).
Here are the dimensions of the OEM filter:
Harbor Freight sells vacuum pumps, but not vacuum pump oil...
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¹ - Neat thing about Prime is that if you get the item and it sucks, or you just don't like it, you can just send it back--w/ free shipping; and usually a full refund within 3-4 hours of UPS logging in the package.