I had to dig deep to find them.



I don’t remember what this header went on. I think that it is too big for the OS.61 and OS.91. If you didn’t realize, the.61 and .91 are the same case, just different piston and sleeve.



The longest pipe is 17 inches. I had it on the.91.
I think that you need the 39mm header, but it will be difficult to connect.



The two on the left I think is what you might be interested in for the.61. The far left is a little smaller and I remember it was in a BVM DF .91 or .96 turning 22k rpms, but really don’t remember. The longest one, second from left, I remember using it on an OS .91. The two on the right I believe are small and used for.46.