Have you tried soaking them with break free and lightly tapping the allen wrench with a hammer to cause a vibration to get the break free into the threads ? Are the nuts exposed from the rear of the backing plate to get any lube into them ? Also allow them to sit overnight with the break free and try tomorrow. A hand held impact driver (manual with a hammer, not air or electric) might shock them loose but might rip the nuts out also.
I have a 2002 900ss and they are always too tight, they snap when you loosen then screws. I also used never seize the last time I put them back on.
Good luck, Dan
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