try either

http://www.pjggraphics.co.uk/acatalo...o_Mk_3_69.html

or this guy on ebay

http://cgi.ebay.co.uk/ws/eBayISAPI.d...532178371&rd=1

I know this link is for a 1600i but this is the guy I got mine from for my S1 and they are very good

hope this helps