C3 in standard gearbox?

For the standard gearbox: C3 is preferred over standard for the two ball race bearings
RMS5 and SKF 6206?

Onder said:

RMS5 and SKF 6206?

Click to expand...

The standard Commando gearbox bearings are; RLS 5, RLS 9 (1 1/4) and the 6203 (which preferably, should be replaced with the NJ203E roller bearing (alternatively, Hemmings 6203TB P63 ball bearing).

AN sells the NJ203E C3.
https://andover-norton.co.uk/en/shop-details/17267/layshaft-roller-bearing-18337-b2-322-

sorry I was looking at the bearings for another box
but the C3 question is what I was after...Thx