Mounting the crossovers for lower fairing mounted MM651's is a PIA. Won't fit in the bucket, so you have to hack the Polk harness up, and run 2 sets of wires to each speaker. I would suggest a pair of Infinity 62.11's. No crossovers and sound at least as good, but the grills won't work. I used the old Polk grills over mine (after Polk stalk failure).
John has an excellent point. . . The infinity's are more user friendly in the lowers with the exception of the grills. But the polks can be installed in that location without too much trouble. Mount the crossovers on the inner fairing just under the speaker brackets on both sides with double sided tape. easy peasy!
How did you install this radio? I have the same bike, our stock radio has 2 plugs and this jensen (and the Metra installation kits) only have for 1 pin. Im trying to install a Kenwood, using a Metra kit. Please help.