Dimensions needed KZ650/900/1000 front rotor info

I need some dimensions for a dual disc, 4 bolt rotor type front wheel. Not sure if all the various displacement bikes use the same dimensions. I'm looking to put an 18" Z1R front wheel on my 550 The 550 has 260mm diam/115mm width. Hopefully there is some combination that will make it a bolt-on.

I need :

-Rotor diam
-Rotor spacing (width)

Thanks

mjg15, quick check (it's outside in the rain)of a 78 KZ650C dual fronts on a 19" cast wheel:

appears to be 115mm inside to inside. Rotor diameter appears to be 270 + mm in dia.

Jim

Rotor diameter reference:

Rainman,
Thanks for going out in the rain, man. I guess that those will be too big . I did a search and saw that some bikes have 10.5" (which should be about what I need), but It wasn't clear what bikes they are on.