Wr250x front rotor bolts

Does anyone know what size the bolts are that go into the front rotor on the WR250X.
Going to try and put a rear rotor off 92 ZX 1100 on wr250x front wheel is the same center distance on the bolt holes the ID of the center is a bit small but will get the machinists at work to fix that. Just wondering if I can use the bolts for the ZX hub or not? they are a 8mm can't find the size of the x's online anywhere. I am going to install them on my WR250R and hopefully use the stock caliber on the front.
Any input would be appreciated
Thanks Steve

Hey Steve,

This is out of the Service Manual:

Item: Front brake disc bolt (WR250X)
Thread Size: M8
Q'ty: 6

Cheers,
Eric