Figured I should get a new rear disc (as @ 0.2mm off min limit), whilst my rear is in bits ~ no wavey comments are required


http://www.davidsilverspares.co.uk/grap ... _large.jpg
Rick Oliver has a pattern OEM for £36. Also Chinese stuff on eBay for similar price claiming to be OEM pattern but unsure if they are (obviously ones with wrong number of holes aren't).
A couple of questions,
1. Was OEM unit only produced in one colour (grey centre as url), or also in black to match bikes with black front centres?
2. Do the pattern OEM ones look identical and are they any good or false economy cos made of chocolate?
Welcome your experiences/advice, but half hoping that someone knows where to source an old stock OEM a bit cheaper or something

Cheers,