The dimensions you gave appear to be for a F33 brush. Those spec out at 7.4mm x 22mmx23.4mm. BTW, the wider brush is a F14 brush.
Some other numbers this F33 brush is said to replace are 1946660, C1AF-10069A, C1AF-10069B, C1VF-10069A, C10069AB, and GB11. Crossover numbers are 81-2202, 3B-7503, and F33.
If you cannot find the F33 locally, my parts guy can get them, but it would be an out of state order at about USD5.00 for a set of two, my cost. No idea on delivery time. If you cannot find the F33 locally, send me a PM about how many sets you would want and where they would be sent. I can then get an idea on postage for you.
Gene