187Z-P - Choose between a 36, 37, 38, 39 or 40 tooth rear sprocket for Bevel Drive [pre 1985] Twins as well as 1987-90 Paso, 750 Sport & 906 Paso - 530 chain size! This is a polished aluminum sprocket by Sprocket Specialists which has also had extra holes bored to make it lighter and look trick. This sprocket is IN STOCK - no waiting 7 weeks like if you order direct from the manuf... If you want a different number of teeth please call me.........