Starter Rebuild Kit - Bare Brush Wires?

I bought a rebuild kit for the starter on my 76 KZ750 - everything looked good except one of the brushes was bare wired - the other one was sleeved/insulated. Has anyone come across this before? does it make a difference? Can I insulate it myself?

Here's the link, the one in the picture shows two insulated brushes. Again, one of mine is bare. Seller says that's how they come now.?? tr.im/oFF3

i dont have that starter in my hands right now but i'm sure the kit will be right lots of the brush kits come that way

Good to know. Now I just have to figure out which one is supposed to be tbe bare one, or if it matters just making sure I didn't get a brush that missed it's insulation some how.