The CS-610 was the only twin they made. They were also badged John Deere and one other brand as I recall. Echo also made a twin air compressor, I can't recall the model but I do have the manual for it. If you think finding one of the saws is hard try finding one of the compressors. I had one and it was a very easy conversion. Mounts like a weedeater and cleaner looking than the converted saw.