reterminating Kimber Bifocal X-crimp sleeve size?

I am replacing WBT spades with bananas on a set of Kimber Bi-Focal X cables that I have had sitting around for several years. These cables currently have the WBT spades inserted directly onto the bare wire without crimp sleeves. I want to terminate these correctly and use crimp sleeves but have no idea what size to use. Anyone with these cables have any advice (or some advice on determining cable guage without having access to a measuring tool). Sorry if this is such a newbie question but this is the first time I am attempting this.