When my Pu was repaired after a woman hit me in the right rear corner the body shop painted the rear insert as close of a match as they could find to the front insert. What they came up with was a BASF color, color code BASF MA725.30 ST. I've searched a couple times but had no luck verifying the color number or if there is a color name associated with it, all I know is the painter said it was part of their standard lineup. When he gave me a bottle of touch up paint he mentioned it was a water based base coat and needs clear over it. It's worth sharing with a paint guy and see what he comes up with.