what about outside dimension of the ears on the step?
i have my bumperettes too far apart, by about 2"....16.25"
How did that happen? Did you drill your own holes to mount the bumperettes?
What I measured was from the center of the hole to the center of the hole in both ears. I know you can spread the sides to be as wide as 15 1/2" apart, but I don't know about 16 1/4".