Sorry for the late reply. Yes, they market is as a "bumper" paint as I believe it has the additive which allows it to flex. This is what you will want to use to paint your exterior trim. I would order one can first and do some test sprays to make sure it is the color that you are looking for. I used it on the mirrors and a cowl vent cover for my 85 GT, and it is indeed very close to the original paint used for the exterior trim.
An alternative is to go to a automotive paint supply store and have them mix you a batch of paint that they can hopefully match, but then you will have to either have someone spray it for you, or if you have paint sprayers, you can do it yourself.