Sorry to reply so late..... I was eating a Peanut Butter sandwich and shooting goonies in the woods.Driving my Jeep that goes anywhere !!
I'd suggest starting with Braley/Graham Isuzu they were able to answer some questions, source some parts, touch up paint, etc... I never took the car in there because the one I bought was running perfect and after enjoying it for a few months I sold it before running in to any problems.
However, in my experience, unless you are dealing with some in-depth TOD system problems or something like that, any reputable shop will be able to address your needs.
I used the profits to buy a life time supply of Peanut Butter - it is so cheap and nutty !!!!
Good luck.