Yes they are a smaller barbless version of what you see with the 1311. The easy way to figure it out is add about 1/4" beyond the tube fastener to figure out where the tang ends under your res-c handle.
I am having the best luck now by using the site
www.imgur.com as it is easy to upload the photos and then just copy the link to post here. There were several tutorials posted about it here on bladeforums that should make it much easier if you have any trouble figuring it out on your own.
Thanks Will, the SF work is keeping me busy when the weather allows me to work in the unheated shop. Down to about 26*F is tolerable, below that my hands get too cold too fast to bother with it. I can't yet say yes or no to barbs on the B8 or BB13 (or a Reg for that matter) yet as the ones I have worked on so far were already stripped or satin so I did not need to pull the handle. I will have a handle off of a BB13 soon to let you know. I would guess probably not on the 8 and maybe on the 13 for the barbs. The barbs do make it a lot more difficult to get the handle started moving which shows how effective they are, but after that it is about the same as the rest. In fact, I would almost venture to guess that in an dire emergency a guy could use it even without the tube fastener. Going back on is much easier as the barbs are perfectly designed for great retention with easy install.