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Here you go. https://www.merlincycles.com/trp-disc-brake-adaptor-89957.html
I've just fitted a PM caliper to a flat mount frame using one of the above (well, actually it was Juin Tech one, but same thing https://www.edgesportsuk.com/store/juin-tech/juin-tech-flat-mount-to-post-mount-adapter-rear-160mm.html)
Flat mount frame, PM caliper, 160mm rotor. What adaptor? Are fork and frame adaptors interchangeable?
This look like a likely candidate.