The bars are from a GoldWing GL1200. I got them used off of Ebay. There are a number of 7/8" bars out there, you just have to find the one that you like. Be careful of the Goldwing bars, some of them are 7/8" at the grip, but the base is one inch. I had to mill out my adapter a bit to make mine fit.
The adapter for mine I purchased used off this forum. They come up for sale every now and then. Some are Heli Bar adapters and others are manufactured by individuals or companies. I think Murphs sells them.
Because I went so extreme, I did have to lengthen the clutch, brake and choke cables. They were purchased from Murph. I was able to reroute the throttle cable to make it work.
It turned out to be a bigger and more expensive job than I expected, but the end result was worth it.