Replacing older mirror

I need to replace the driver-side mirror head on our 1997 Safari Sahara. (The original mirror head got clipped by a truck, which did not stop.) The 22-year-old mirror was made by Velvac and is what they called their Superstar mirror head. It’s 13 inches by 8+ inches, rectangular with rounded corners, not tapered at the top like newer models. The mirror head is out of production and I cannot find one in any of the major salvage yards. I therefore have in mind replacing both mirror heads and keeping the original bus mounting arms.

Speaking with Velvac technical assistance has been an exercise in frustration. All they seem to want to do is sell me two complete new mirrors. Never mind that the mounting holes in the new bases do not match the holes in the coach facing.

Has anyone replaced a 1990’s-era mirror head with a newer head on the original mirror arm? What problems did you need to overcome?

My mirror has 5 wires in the 6-wire plug, which looks the same as the newer plugs on 5-wire mirror heads. Can anyone tell me if the wiring pattern is the same, or will I have to puzzle out which new wire mates with which old wire?

Thanks!
Wayne