sorry, last time i checked, markup isnt from the factory. it’s added by the reseller. therefore some places add it, some dont. and a drop top is about 3 or 4k more than a coupe. where did you look? McCrackin?
http://www.edmunds.com/new/2007/ford/shelbygt500/index.html
doesnt need to be N/A
the argument is production motor vs production motor.