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First of all, it is a "wheel bolt" not a "wheel nut". Huge difference and a wheel nut won't work...!!

So:
M12x1.25 thread
Taper seat
23mm (ish) from tip to start of taper

Early 156 had 19mm hex heads, but later had 17mm. Yours are probably 17mm.
 

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I'm sure they will be fine.

Is the thread in the hub ok?
 
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