There is but it's ugly and if the fork has internal routing it can be a tight angle for cable brakes to feel any good, also are you running long pull levers with them?
Will be flat bars, external routing too.
Might have a rogue set of Hayes somewhere, with post mount fixings, may sequester those as FM to PM seems to be easier to find.
@snottyotter started
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There is but it's ugly and if the fork has internal routing it can be a tight angle for cable brakes to feel any good, also are you running long pull levers with them?