Not sure those will work. Those look like they have little rubber bushings that expand when you tighten the screw. The stock 919 bar ends thread into the end of the inner weight assembly. Those ones will fit a 7/8" bar, but looking at them, they look to be too deep to fit into the handlebars without removing the bar weights. There are a ton of guys on here that have swapped bars out and probably have old ones lying around that they might be willing to part with.
I am one of those people, but I am swamped with stuff that I gotta get done before I go out of town on Thursday and won't be able to make it to the post office before I leave. PM me in the beginning of August if you still haven't gotten any, and I will send you mine, no charge. One has a scratch on it, but I'm guessing you won't mind.
My goal is simple. It is a complete understanding of the universe, why it is as it is and why it exists at all.
- Stephen Hawking