To do it to factory specs you would need to buy fenders that are made for the shields, and the shields. The factory frenches the fender (same exact size indentation into the fender material so the shield sits down in the fender). This would require painting the fenders, sanding, detrimming, and blending the hood, both doors, and the front bumper cover in order for all the paint to match. Cost for this? Several thousand dollars to do it correctly. Or you can buy stick on aftermarket shields but anyone who knows anything about them will know they are fake aftermarket shields. Cost for these? 50$ on Ebay?
Yoshi shield are the best aftermarket and already have the curve. Plus they are thin to look more authentic
Its worth noting that the original aluminum wings have a recess in them for the shields to be bolted into position so you'll never get factory perfect look but you can get very close. Some of the aftermarket shields (Yoshi ones for example, often for sale on ebay) are very good quality and they are thinner to mimick the thickness you'd get with the recessed ones so only a trained eye can tell the difference. Whatever you do, don't be tempted to fit the horrible stick on type which are made from plastic, they look horrible, makes the car look like a replica imho.
Try doing a search, search is your friend! Lots of threads on the issue to help you out. Here is one that I started after my wife did the install on my 360. http://www.ferrarichat.com/forum/showthread.php?t=143326
This is one of the best upgrades to me. I have parked right next to another 360 with the factory option a couple of times at our local car meets, and you really have to look closely to see the difference between his car and my car with Yoshi Shields- closer than anyone would ever look unless looking specifically to see if they can tell the difference. I was very carful when installing them to get the location right, and I think I recall reading e60 m5's thread back then. In the worst case if you or another owner wanted to remove (not sure why you would want to), a couple of minutes with a hairdrier and careful pulling should remove them with no issues (the same technique I use to remove dealer stickers/labels they put on cars). Here is an old link I have for Yoshi's website. I bought the shields, and they came in the mail before my car arrived from the dealer- put them on the second day I owned the car! http://yoshield.com/
there is a local body shop in Carson, CA that specializes in this, they actually "stamp" the fender while it remains on the car to create the lower, "debossed" region to accept the shield. It is just like the factory, probably even better. The fender does have to be resprayed which means both fenders, it looked like $2-4k worth of work to me, not sure of the price. Excellent results. Paint match was excellent as well. Its a project but they can be added with a great result. I think they are called Premier motor sports, very talented shop that does Ferrari cars only. No relation or affiliation to me.
Man, for the money and trouble why wouldn't someone just start with the Yoshi shields and see how you like it. Buying a used 360, I think I'd actually prefer one with yoshi shields that can be removed vs. some body shop (no matter how good) punching out recessions in fenders and repainting stuff.
