£8.35 for a whole new pot, cap & diaphragm:
http://pdq1.com/part.php?PartID=2896&MakeID=0&ModelID=0&YearID=0&Y ear=0 30ml is shown as the right size and style for a 996 but you might need to check.
other suppliers to check out:
Mode Performance, Silverstone -
http://www.modeperformance.co.uk/ and
http://www.biketorqueracing.co.uk/br...der-reservoirs