Horseybusiness

Apologies if I have posted in the wrong place, this is my first post. Having just has someone takeout the left front fender and bumper of my E60 550i (pre-lci) I am left wondering if I should go down the route of replacing with the M5 fenders and bumper, question to anyone who might have done this is; A. are all the parts a straight swap out. B. Any have some bits or point me in the right direction of a good NZ source.