Interesting.
I bought a RYCO brand filter for my M62 last time, because they didnt have Mann in stock. When I screwed the canister lid back on, the damn filter was about 1/8 inch too tall, and it squashed the paper ribs all distorted. Took it back to the dealers, and they said that would be fine, "as the paper filter was technically still intact"
Bought the more expensive Mann filter anyway.