It doesn't need to be from the Augusta Medical Systems brand, it can be from any brand. The issue I had was that the B cylinder is too small, and the C cylinder is just right but the base of the C cylinder is so big my testicles get sucked up into it, which doesn't happen with the B cylinder. Very aggravating.
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Find this strange, the rubber seal/cushion you use in the 'B' cylinder is the same as in the 'C' cylinder, so you have the same size opening for both cylinders, have a good shave and don't get any lube gel on or around your ball sack, get a good seal.