I'll be adding a pit mat to my next order , the old t-shirt I've been using just isn't cutting it....lol

I saw an ad in RCDriver for the Vtrax10 esc. The measurments at the bottom of the page show the 10R as the bigger ( only taller) of the two. Is that correct? I would have thought it was the smaller one because some race bread buggies are tight for space.