The amplifier relocation kit shown at your picture is what all three of my 95 Classics have - I suspect, from the factory.
The idiocy of the solution is that it puts the amplifier right next to the radiator tank, negating probably a lot of the gains of moving it away from the engine.
But now, with - I suspect - 100% of the replacement amplifiers coming from China, they are fickle off the bat. All electronics comes from China, but, at least, I'd like to use a hopefully more heavy-duty part so it works for a little longer. And, of course, you can buy 4-pin GM-style modules in most part stores.