They still have the high quality lead-bronze bearing substrate of the original, but offer a more advanced bearing surface than the original lead-indium over with a superior lead-tin-copper finish overlay for longer life and greater wear resistance. Std. size part no. 06.4285. -0.010in part no. 06.4286. -0.020in part no. 06.4287. All £34.80 plus VAT from your preferred Norton parts dealer. Andover Norton are on 01488 686816. www.andover-norton.co.ukEnjoy more Classic Bike Guide reading in the monthly magazine. Click here to subscribe.