Ah, I suspect that is the G-fork, yokes and brake calipers.
Wheels are definitively Y1 ones (48 spokes and aluminium rims!).
Brake discs are not from the Y1, as far as I can recognise from the pics.
I have a loose wheel hub of a Y1 and can do some measurements or ship it as a sample, but need that returned again.
Hope that KK can help you with that 😉
With the old type of dicsc (small (58mm) inner diameter and four fixing screws) a lot of Kawa discs fit there, that is not an issue.
Determine via outer diameter, thickness and offset.