Thank you for the hints so far.
I now have a Yoke and the three point unit is on its way.
Does anybody know where to get the hard hollow pins please? The bearings are fairly universal based on the numbers on the seals and bearings.
What are your opinions on fitting a grease point if it is possible? E.g. nipple or removable bolt @ say 3 or 4mm then grease could be pumped in using a rubber glove finger as a seal between pointy nozzle and hole?
If you want genuine, then try a dealer
Part number will be listed on this page, or navigate on the site to your bike 
Simply bearings are a copany with good reputation for supplying standard bearings, seals etc, I have used them several times and they have always given good service.
Sorry, I’ve no experience of the Norge to offer advice on fitting a grease nipple etc, it sounds like a good idea so long as it doesn’t introduce a stress point into the casting.
When i had a CARC i briefly looked at fitting grease points to the bearings.
Easiest from outside but as the needle rollers come with a complete outer race it was hard to see where the grease could get in to the bearing.
If i had the tools/skills running a greaseway down the bolts and out through the collars would seem best. But i had/have neither those skills not those tools 
Thank you for pointing me this way. They are hardened sleeves I would have had a problem with that.
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Thank you for the info.
Very useful, thank you.