I think the adapters are universal, as in you don't have to use a trp branded one. You do need to choose one based on the rotor size you want to use, 140mm or 160mm.
The clarks ones are probably cheapest.
The only downside is that post mount calipers on flat mount frames can look a bit ugly due to the adapter making them stick out a bit.
On some frames the shape of the seat stay/chain stay junction might not allow an adapter to fit if its a small size frame
Thanks! Yeah I'm not wild about them sticking out - seems the world is sold out of spyres at the moment so trying to figure a work around.
@sharpeleven started
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I think the adapters are universal, as in you don't have to use a trp branded one.
You do need to choose one based on the rotor size you want to use, 140mm or 160mm.
The clarks ones are probably cheapest.
The only downside is that post mount calipers on flat mount frames can look a bit ugly due to the adapter making them stick out a bit.
On some frames the shape of the seat stay/chain stay junction might not allow an adapter to fit if its a small size frame