 You want to raise the backup. Really, at this point, then the only way to do that, to get it raised, you could put new springs on it back there or take yours off and send them in and have them re-arched where they bend them and make them a little higher. That is going to be probably the cheapest. Either new springs or a re-arched spring is probably going to be your cheapest thing to keep it looking 100% stock.