I just noticed when mounting my snow tires that the boot covering my right front strut is broken. How common is that? (I only have 50k miles on my 2008 M5). The part is only $26.00, but does onyone know how hard it is to replace? If i need to remove the entire assembly and use a spring compresser I will have to take it to a dealer--not sure how much time that job might take.