I need to change the cylinders and i dont have an application for the axle. Spent an hour at napa looking for the correct cylinder and found two that i thought would work. Got them home and the brake line fittings are too small. They fit my 12 bolt lines. I have the smaller drums and the cylinders have a 45* angle to them and they point out to the rear not down. I just made new rear hard lines and dont really want to do this again. GM needs an application and there cylinders are like $60. $13 dollar napa ones are a lot more appealing. So, do they make an adapter i can get that will go from one size to the next or does anyone know how to get me a napa number for this cylinder? 29337C. Drivers side. Will need the matching passenger side number but that brake cylinder isn't off yet. Want to do one at a time. HELP!!!