Thank you for your quick response...and the coding info. My son just bought a new Tracker OX400, and we went looking for maintenance parts...oil/fuel/air filters, spark plugs etc. The dealer prices on that stuff seemed high, so we searched for cross references. Of course, one of the first things you usually need is the engine model number. We did find the following:
FILTER-AIR (outer)
Kawasaki item #'s 11013-7029, 11013-7048, 11013-1290, M113621, MIU10783, 820263.
https://www.amazon.com/Harbot-11013-7029-11013-7048-K1211-82320-K2581-82311/dp/B07D2XR9J2/ref=sr_1_1?dchild=1&keywords=Harbot+Air+Filter+for+Kohler+25+083+02-S+Kawasaki+11013-7029&qid=1595349429&sr=8-1
WIX Filters - 46449 Heavy Duty Radial Seal Outer Air
K&N REPLACEMENT INDUSTRIAL AIR FILTER-4552
FILTER-OIL
Item# 49065-7010
https://www.kawasaki.com/accessories/item/filter-oil/490657010
KAWASAKI 49065-7010 OIL FILTER CROSS REFERENCES AND REPLACEMENTS
https://oilfilterscross.com/49065-7010/c9873/
Is there anything about the Kawasaki two letter prefixes (FJ, in this case) that indicate whether the engine has a horizontal or vertical shaft?