While putting on new brakes (300zx calipers), I noticed that the boots on the drive shafts were getting several small cracks (rubber is gettin dried out). This isn't a problem now, but could be in the future. Has anyone replaced them before? I'm thinking that there is a repair kit that contains boots/grease/clamps to remedy the problem. Do these exist? If so, a ball park figure on the price? Replacing them doesn't seem all that difficult, just time consuming. Thanks!