In many cases the companies (3M etc) will offer a pre-cut pack of segments that cover the main areas. I suspect it will be a package like this, check which areas it covers, some are just front panels, it might be worth covering the lower edges of the rear wings as well, mine have a few marks where they have saved the paint.

As an example - http://www.chipguard.co.uk/car-protection/morgan.html

Everyone loves a Morgan. Even me, unless it's broken again.