It's not a great deal - I got 1 prolite for the RG500 from evilbay for £50 brand new from the fast one, delivered !.... rite...
The disc for the other side set me back three times that !
Carbone Lorraine work well with prolites, way better than any stock or EBC pad so spend some dosh on the pad you use while you are at it..
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These aren't the droids you're looking for.