I'm looking to get a 458 Spider but many of the cars I'm seeing do not seem to have the front lifter option. I've got quite a nasty driveway and so I think I'd feel peace of mind having this feature just in case. I was just wondering, is this option retro-fittable? And if so, what sort of price are we talking? Or do I really need to be narrowing down the cars I'm looking at to ones with it factory fitted?