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I have a set of Chevy Silverado mirrors that I adapted to my 2001 GUII. I have the indicators on the front side and also a blinking arrow in the glass that can be seen by anyone overtaking.
I also have the LED reverse lights working in mine.
I had to find the exact pins (right side has different pins and different plug) to add to the plugs on the body side. To the best of my knowledge, the GU didn't have indicators as options but it had heated & electric fold-in and those wires are in the doors. I used them for my installation.
Easy? That depends on how competent you are with wiring and how much patience/resolve you have
The indicator wire for left side is also hard to find. It comes right around the engine bay from the right hand side. I took it from the loom inside the engine bay where it feeds the side blinker.
Clearview didn't have mirrors for GU with indicators at the time and their price was outrageous anyway - $795. I bought mine in the US for $173US from Amazon.