Tim has one in his 75....
I want one in bad condition as I want to paint it and Tims is spotless...
They seem to go for £125 to £175 on ebay depending on if good or vgood condition.
The one below isn't perforated but you can die it black...
http://cgi.ebay.co.uk/ROVER-75-MGZT-...item3cb77caac6