Unfortunately I had a crash at last sunday training and my rear caliper and bracket fell apart. I found few yz450f 09-11 calipers/brackets on ebey for a nice price, but their part numbers are 17D-2580W-01-00 and it does not fit my wr450f 2009, accordingly to producer information. Caliper for wr450f 2009 should be 1C3-2580W-72-00. Can smbd tell me the difference between wr450f 2009 and yz450f 2011calipers? Is it minor and calipers are interchangable, or not? The same quuestion I have about waterpump and clutch covers (they are broken too), should I look for 07-11 wr450f covers only, or other years/models covers will fit? Thanks.