GG 250 rod( same with 200 & 300) is a honda cr250 rod(84-01); la sleeve calls this at 125.3mm, but vesrah(oem) calls it at 126; i prefer to use an ims "pro series" rod kit, due to an improved lower bearing/just out of curiosity, i measured a couple "used" rods laying around here; the ims rod measured at 125.3mm vs vesrah rod at 125.5mm; the vesrah rod is less expensive and i would assume a high standard of "japanese" quality,...
i know, kind of "long winded"(again!) jack