I bought this ball mount that goes into the inner side of the handlebar
https://www.amazon.com/gp/product/B005K91802/ref=oh_aui_detailpage_o02_s00?ie=UTF8&psc=1
from there its just the standard RAM mount kit
This is the arm that I am using, its a little bit longer than the one in the above pic, but it is very adjustable and it centers the phone nicely
https://www.amazon.com/gp/product/B009SX0J88/ref=oh_aui_detailpage_o03_s00?ie=UTF8&psc=1
https://www.amazon.com/gp/product/B005K91802/ref=oh_aui_detailpage_o02_s00?ie=UTF8&psc=1
from there its just the standard RAM mount kit



This is the arm that I am using, its a little bit longer than the one in the above pic, but it is very adjustable and it centers the phone nicely
https://www.amazon.com/gp/product/B009SX0J88/ref=oh_aui_detailpage_o03_s00?ie=UTF8&psc=1