I did receive what I thought was the correct replacement bearings from XXCycle but the package was marked with Stronglight part no. 260 085 (XXCycles part no is 11423) but the Stronglight part list shows this as "Set of NCS bearings 45deg- 41.??" (the last part is unreadable.)
but that 41.xx must refer to the outside diam which I do measure as about 41.5ish and which is too big for my headset.

stupidly, I have mislaid the original top washer (I've been working on this for about 6 months now) so I cannot exactly measure the original bearing set.
but my original notes say that I need something that measures about 36.50mm max 1 7/16" outside diam.