1997/98 is right on the changover from the telescopic tensioner to the pivoting tensioner (pictured) the belt is the same on all quad cam EJ20's but the tensioner quite possibly won't fit.

Also, EJ20G is a really old engine, even older than yours. I think they mean EJ205 or EJ207??

Your JDM engine may not have an oil cooler fitted, if so one of the waterpump outlets will need to be blanked or the correct non oil cooler waterpump be fitted.