Brake rotor bolt pattern

[FLH_Rider]

I picked up a sidecar that had been converted to disk brake, it's anchored off the fender bracket and is a 11 1/2 inch rotor. I am going to put a 10 inch rotor on it and make a bracket to anchor off of.
My question is, what 10 inch rotor would have the same bolt pattern to fit a 2000 FLHT front wheel,,
Thanks