Sure, will see what I can do
So, the large bearing was easy. It's got 608Z written on the side, so I simply ordered a 608Z beaing
The small bearing was slightly trickier: It's writing on the side said R-1560KK (NMB)
Now, I couldn't find that for sale other than in large numbers directly from China, which wasn't very helpful.
However, I *did* find an NMB part number breakdown.
So, the breakdown was as follows:
R - series minature bearing
15 - 15mm outer diameter
60 - 6mm inner diameter
(depth specified in the NMB chart as 5mm)
The KK means the bearing has metal shields each side to protect the balls (the options are open - never really seen in cars etc, sealed (rubber seals but without metal protection) or shielded (rubber seals protected by metal sides).
So, looking aroudn, the 696ZZ bearing is a generic part number (ie not just NMB) for a 15x60x5mm bearing with metal shields.
Seems to work just the same as before - noise gone
Particularly pleased that it is not a repair Nissan would've offered, they'd have wanted hundreds of pounds to replace the fan unit.