I am just taking a wild guess, and am assuming the 'wide' spur gear, means it's wider so that the whole pinion is contacting all of the spur in a sense.... not sure quite how else to word that -lol- As in - it doesnt have a larger diameter - just width... kinda like looking at the tyres on the back of a lamborghini and a little fiat panda... the "wide" spur gear is like a lambo's rear tyres - is that correct??

Looks great tho man - love that motor mount...