H89 wasn't sold here either ... but during the 1980s/1990s they sent over container loads of 'good used Japanese engines', so sometime you'll find one!

Before you plug the coolant ports, be aware that it will cause part-throttle performance to suffer a little bit. GX doesn't have a heat riser, so it won't combust perfectly unless the coolant passage work. But mid-throttle and full-throttle will work fine