I have 2 bikes with 8" XT, I've used shimano, grc, jagwire and grimeca adaptors (almost all of them made except CTS sports and an obscure taiwanese company.) The cheapest is Jagwire ($10), but they aren't even close on the spacing. The jagwire adaptor doesn't place the caliper far enough away for 203mm and you get some serious drag on the outside edge. I broke a grc adaptor because i had to slightly modify it since it would not fit on my QR 01' Z1 MCR (although it worked on all other forks). The bolt holes slowly enlarged until the bolt broke right through. Shimano are the most expensive, and trouble free. In my experience the best ones are the Grimeca 203mm adaptors. They cost about $18 and work perfect.
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