Arai RX7 Corsair size L: Does not fit
Caberg Trip size L: Does not fit
LS2 370 size L: Does not fit
Arai Quantum size S: DOES fit
Shark RSX size S: Does fit
All my and my GF's helmets are full face, I believe it depends more on shell size than brand. Size L will fit in the top box, hence I don't care if it fits under the seat or not. The first thing I consider when getting a new lid is the performance in the Sharp crash test:
http://sharp.direct.gov.uk , anything else comes second.