My rear rotor on my 1998 ST1100 ABS/TCS II is worn a bit a slightly rough to the touch. I let the pads get ground down to the metal. I'm struggling to find good aftermarket rotor options, as the OEM part for the rear rotor was only built for this particular model, years 96-2002. I'm considering taking it to get resurfaced, I have access to digital calipers at work but have not measured the thickness on it yet. Any thoughts?