You can see if they have this in stock. They have lots of Derbi stuff but not sure how much is in stock.
http://www.bike-spares.co.uk/cgi-bi...&PN=ENGINE_PARTS_SENDA_95_99.html#a1236#a1236
From my personal experiences with bike-spares, I'd avoid them. I ordered a bunch of Derbi parts from them over a year ago and have yet to see any of them. First were claims of back order and then of them being shipped and returned to sender and now they won't even respond to me. ymmv. :mad
well I guess if I can't get parts were all screwed. Im supposed to be the man. LOL!!!!!!