Thanks for getting back to me. As it turned out, I took a chance and ordered a new Plastimo Contest 101 compass and fitted it over the weekend. Turns out it was “almost” an exact match for the old unit. The four holes for the nylon rods were a perfect fit, but the bottom part which I assume contains the light for the unit is wider on the new ones, and didn’t quite fit. Nothing I couldn’t handle with a power saw. I widened the slot at the bottom and the Contest 101 fit in perfectly. Now to see if it doesn’t leak into the cabin when it rains.
Thanks for the tip on the Navman. Not sure I’ll bother upgrading that. I might just remove it and cover/seal the hole. Good spot for a cupholder.