They'll only fit in the grooves they're made for. The top 2 rings are different thicknesses and the thicker one won't go in the thinner slot. No way to mix 'em up ...... but wait ..... some of the stuff I see done here ..... I think I've seen it all but then someone changes his throttle cable by bending the holder open with pliers, lol ..... that'll always be my fav but new ones happen almost every day.