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I ordered these for Elixr R brakes
http://www.wiggle.co.uk/avid-elixir-sintered-brake-pads-and-steel-backplate/
And elixr XO pads arrived.
Pretty sure the pads are incompatible but could STW confirm that for me? Cheers
i'm sure all elixir pads are the same! but some of the XO brakes are not elixir
if they look like the top pads they will fit, the bottom will not 😉
[img] 
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edit- the callipers are the 4 pot XO btw
I concur with what rh85 says above.
I bought some Elixir pads a few weeks ago. The front of the package says "Avid Elixir X0 XX" while the back says "Elixir disc brake pads, organic pads, steel backing plate" and they are the same shape as the pad in the top right of the above post.
x0 pads are fine, x0 trail pads are the bigger 4 pot ones.
Cheers for the advice. Popped the pads in tonight, so easy to fit compared to the old Juicy's I had on a previous bike.