I was looking at doing a rack conversion on my 620.What i found out is that NO off-the-shelf rack will work.The 620 is just too narrow.Also,there is a critical area with regards to rack width and it is called"Bump steer".If this is not addressed in the design,it can get you killed...easily.
After all that is said,a custom rack can be fabbed but it will be $$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$.:eek: