I have the 140mm mk10 rockarm. It works with 200/51mm damper. 200/57mm works as well but 2,4" or bigger 2,25" tires will hit the seatube if fully compressed. The rockarm has to bei slightly modified on the inside with a file. Not a big deal.
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Which version of rockarm did you use ? I have a 301 MK3, I can be interested.