the rear main bearing size for a 35+21 novarossi engine is 14.5mm inside dia and 26mm outside dia and 6mm wide and front bearing for the 35+21 is 7mm inside dia 19mm outside dia and 5mm wide the front is a special size only the 35plus and i think the nova plus3c 7 port 21 onroad engine and the plus 2 359 engine all should have a 5mm wide front bearing. All the off road engines 21 size will use a 7mm inside dia 19mm outside dia and 6mm wide front bearing. Regards Jeremy.

Im not shore if i miss read your post are you looking to get sizes on the balls only?? or the bearing sizes??