| Nah, there is a bearing code used by all manufacturers that denotes the type and size of bearing. All you need to do is take the bearing code to any bearing factor and get some SKF, Timken or Steyr and they'll be top quality - and only cost you about £9 each.
All you need to avoid are the cheap pattern bearings from China - I put some in the rear wheel of my ST once (£6 each) and they lasted three months | 
Jools
Threaded Mode