ok so you have a hope m4. is it a mono m4 or a m4. mono is black and m4 is silver. basically hope calipers come in different types all of which have a number. if you have a 203mm disc with no +20mm adapter then you will be able to find a post mount adapter but will need a 223mm disc aswell. if you have a +20mm adapter fitted (caliper 5 +adapter) then that means that you should be able to remove the 20mm adapter and swop it for a post mount adapter and your in business.
hope that makes sense.
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