Are there a 4-digit number on your bearings?This should help you out,maybe.I guess you will get the same size on the bearings (inner and outer diameter) but you maybe dont get the lip and screw on them.What is the outer diameter on the bearings?If you dont get the lip-and-screw bearing,you may just make a lip for them,like a stop ring.If you loosen up the bolts for the bearing mounts,are the bearings running more freely then?

Anyway,i would have lined up the gears both for the looks and for the anti-wear,it will get stronger and wear more even too