It's hard to gauge as the set I have is quite old and not terribly pliable now. However, I don't think that they'd be any worse than an aftermarket body side moulding -- the consistency of the material has a definite stiffness. There is adhesive on the back, with the mandatory green tape to cover it as found on other Chrysler emblems and trim.

Cross-section is about 1cm x .5cm and rounded.

They are definitely an extrusion. I would think that if one had access to the right forming equipment, a die with the right profile would be very easy to make.

My NOS set is black.