I bought some 0.3 mm "tunning washers" in a local shop, and using 2 on each side I can reassemble the rocker without any play. They are made of steel though and I expect them to rust quickly, so longer term I would like to get some of those washers bossman suggested (or something else made of stainless steel).
I didn't change the bottom bearings yet but I expect these won't fit, the extra 1.2 mm will be too wide for the chainstay part.
I think for the other bearings I will buy generic ones, they will need more frequent changing but they are also much cheaper and (I hope) will fit correctly.