I've got an RX7 corsair and it fits great, I love it. But a word of warning to all with Arai helmets......
DON'T USE CLEANING PRODUCTS ON THEM!!!
I had to send mine back because I stupidly didn't read the small print and used a very well known brand of visor cleaner and it degraded the plastic side pods to the point that they became brittle and broke.
Arai have serviced and replaced the parts for me (at a cost) but I would recommend only using soapy water. Especially on Arais.
Other than that, get the helmet that fits you best, as long as it has the gold sticker (and 2 black lines round the edge of the sticker) it'll be fine.
