Have a look at : -
http://www.rsvr.net/pages/specialoff...bsection=&c=17 OK, they're for Aprilia Mille R so I'm not sure they'll be a straight swap depending on the type of Ohlins you have, but at £999 + VAT including calipers and pads that gives you an idea...
Alternatively, find a breaker who has an '03 RSVR - there were plenty around and all had radial calipers with the correct discs fitted to their Ohlins forks as standard.
Happy hunting!
Clippy