i have a 1991 blaster as far as i know thats the right year never owned a quad and i was jw how u change the rear sprocket ? i ordered a new one from rocky mountian atv hopefully its the right one. could i have ordered the wrong one are there diff styles or if i put in the right year or is it like one size fits all blasters ? im just worried because mine looks like it has like 8 bolts just confused lol.