Could also give them military style ranks.... from biggest to smallest:
Armadillo Admiral
Armadillo Captain
Armadillo Commander
Armadillo LT

Note some play on words here. Such as the Armadillo Commander is the non-wincher XK (commander) replacement bumper.... properly termed the "Armadillo Commander". Then as the bumper adds capabilities it increases in "ranks".
And finally the "Lieutenant", deemed the LT which is often a short version for "light"... which would be a light-weight tube style bumper.