quick view Add to Cart Norton 500, ES2, Model 50 Single, Terrys Valve Springs. VS530, NOS MSRP: £24.95 Norton 500 ES2, Model 50 Single,Valve springs, 1 Set, (2 pairs), NOS Terrys original box and packing. VS530. Please ensure this is the correct part before placing your order. Add to Cart Add to Wish List Add to My Wish List Create New Wish List