I couldn’t find one, went for an AbsoluteBlack instead.
Almost made one though – manage to bend a round alu N/W when a bolt popped and I didn’t notice, so replaced that with a Surly stainless (round one). Lost another bolt, didn’t notice for a couple of rides but when I did, I couldn’t put the bolt back in, as the ring had deformed and the hole didn’t line up any more. Realised the ring was turning itself into an oval, so bashed it back into shape and ordered an oval one. Fitted it and raced the British XC the other week, I’d love to say it felt amazing, just felt normal.
Round ones were 34T, the oval’s 36. I’m SS as well, I figure N/W isn’t a big deal. If the chain’s coming off then more likely the tension’s not right.