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researched, I tried both on my 2008 MR1's they both fit.
K&N 303 for MR-1 engines 2007 & below, 10mm longer as per scokill above my post. (I use the 303's for my boat & PWC's)
K&N 204 for MR-1 2008 & up
and from others said above:
K&N HP 1002 for 1.8 engines.