Terry mine were 135cm before I welded the extra bit on, they are now 175cm. I would have bought the longer ones if I had known they were available. I bought my first one about 5 years ago and the second one about 2 years ago. They are a terrific invention.
P.S. I went to the Ballarat swap, plunger A10 fuel tanks were like flies, all over the place (well, three of them anyway) I bought a good one with badges and kneepad plates for $50. Probably should have bought the other two, they were both good tanks capable of being re-chromed.