Flat Talon sprocket is part no TR 241 - No of teeth required, Steve Sell at Marlimar-UK has loads of stuff, some NOS, some S/H, try him at steve@marlimar-uk.wannadoo.co.uk or ossa.mar@ntlworld.com, sometimes he takes a while to get back but he's very helpful. Further afield, try Keith Lynas at Ossa planet (website), KLynas@aol.com , what he doesn't know about and have for Ossas isn't worth talking about, loads of NOS and repro parts too, his Wiseco pistons are the mutts nuts, he's in California, parts take about 10 days, postage not much more than UK rates really. There's a Spanish website, Ossa Cels with a lot of stuff on but I've never tried them personally, Hope this helps