I found this website
https://www.osengines.com/index.html and it has a different list. It shows the only LA in product as the 25LA but the site appears to be Horizon owned which must translate to only what they choose to import. Hemikiller has the Japanese site in his link which show everything.
Airplane engines:
https://www.osengines.com/engines-airplane/index.html
Discontinued Engines part listings:
https://www.osengines.com/parts/discontinued.html