BobsYourUncle,
Unfortunately, due to a trip and then having the grand-daughter (....oh, and her parents) visit for the last week, I put off dealing with this issue.
Coincidently, dropped them off at the airport today, so as soon as the weather cooperates a bit (currently a gazillion degrees below zero and about 6 inches of snow on the ground, and any work will be done outside as the garage is taken up by my woodworking shop), I will re-direct my attention to it.
I have removed, and replaced, multiple dash panels for an aftermarket Nav system in the past so hopefully, this won't be any more difficult.
Marv