Your saying the Japanese ones you had were OME KOYOs? Koyos have the seal inside the lip cup, like a miniture cam seal.
The joints with made in Japan , nothing like the OEM, don't recall seeing any labal on the cups,,,the rubber was so weak that all the grease would only come out of one cup,so weak it was like there was no cup on it.

The Precesion had made in USA cast into it. The cups are big and thick. The caps are beveled on the ends , little easier to press in.

dave h.
'89 Raider V6 5spd;Aisin Hubs;; Gen2 LS: frt. brakes, rear coils;U.C.arms;R.trailing arms;idler arm; rear LSD axle w.disc brakes ;2 battery system for Dog's fan; relocated ECU; custom bumpers;J.Baker receiver;Conferr roofrack; t-bar crank.