Mate, I was looking for ne for mine (Long), couldn’t get one at all for that wheelbase (not that any of the companies would happily say ‘would work’ anyhow 🙂 ). I had a Thule one which would fasten if the tyres were deflated but really wasn’t comfortable saying it was safe, if you know what I mean…only had about one click of the ratchet fastened in both sides 😀 not ideal.
The only thing I did think of but didn’t get was one that mounted on the tow-bar/ball and went up to hold the top tube, but never got around to testing anything.
Be interested to see if you find anything though buddy 🙂