skysensor -- Thanks for the pics, I'm doing this over the weekend myself (just got the parts). Looking at these and others, I am thinking I should have gotten the short arm, but got the standard as it was part of a 'kit'.
If possible, could you take another shot, with the RAM ball pointing down/away from the keyslot (basically how you have it in your pics), but with the short arm pointing up to the keyhole, and the GPS on top of it?
I'm debating buying the short arm, and if I can have the GPS 'sit' centered on the handlebars, with full visibility of the dash, I'll probably do it. I figure my standard arm will be too long and block some of the bike's dash when positioned that way.