Ametek-Motors Carbon Brush, 33490-2

do these come in sets of 2?

Will this fit motor 6600-25

will this fit a ametek E-14996-2 vacuum cleaner motor? if not which one would fit that model? it was found in a Ovis central vacuum cleaner

Is this compatible for Nutone CV-352 unit? it looks like it might, but don't want to purchase until i get confirmation