yh bearing slides on nice and easy and now got it located ,, now for clutch , on the old one it was wrote gearbox side but new one has no marking to indicate which way , can I assume it is just the same as old one so the thicker side is gearbox side have included pics off old and new plateI think you will find you press /drive it in to the stop/lip, which usually means the bearing is fully supported around it's outer ring.
Remember to get a socket that just slides into the hole so that when pressed against the outer ring of the bearing it gives good support without jamming, never hit the middle area of the bearing as it will cause damage.
Have you checked the new bearing is an easy slide fit over the gearbox shaft that it supports?