The Shimano XTR M9100 XC Brake Caliper (post mount) uses flat mount format pads (so you only have to buy one sort of pads for your bike)
but it is a bit expensive.
That is a bit expensive. I'd be more inclined to source a flat mount fork to use my existing brakes if I needed to spend £100 on one caliper
@PhilDAS started
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The Shimano XTR M9100 XC Brake Caliper (post mount) uses flat mount format pads (so you only have to buy one sort of pads for your bike)
but it is a bit expensive.