Halo combat rear hub disc problem

I bought a set of 24" halo combat wheels for my lads stinky jr build the, front hub takes a standard 160mm disc no problem but on the rear hub the disc holes don't match up.
What type of disc will the rear take any ideas the lad I bought them off was running a hope O2 brake and disc on it is this a different 6 hole pattern ?
Thanks for the help in advance
What type of disc will the rear take any ideas the lad I bought them off was running a hope O2 brake and disc on it is this a different 6 hole pattern ?
Thanks for the help in advance
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Parktools :?:SheldonBrown
any ideas ?
have you tried the front disc to check it is not the rear disc that is at fault.
Parktools :?:SheldonBrown
its got me beat ive searched all over to find out why it wont take a normal disc