These guys; at times have brand new engines that meet your request,  but right now they don't  if you are not in a hurry, like a year or two, they may have something come up.

They are great for hydraulic fittings, parts, hoses. I did some tractor mods using them for the parts and they were on time and ok on pricing.

Hydraulic guy out in farm country

The air cooled is bit harder to find.

Best of luck:

Norm