You might want to work backward. Determine the length of the springbar that you need. Make sure that you know whether you are measuring outer-end-to-outer-end, or center of head to middle of U-bolt. Maybe sketch it. Then find a big hitch dealer (they've gotta have a ton of 'em in Florida), go in and talk to him, and see if you can buy the bars you need.
Or go visit him and take the bars that you currently have with you. Explain what you need that is different. Don't bother to go into a whole bunch of stuff about why you need them, and how a TM is built, and the problems of the swing tongue. He doesn't know and doesn't care, and it will just confuse the discussion. If you make it easy for him, he'll be more helpful, and you'll be happier.
As a last resort - or maybe a first - install the springbar lift-hook brackets where you need them on the TM frame, hook up your TM, go see him, and let him make the measurements.
If your current bars are clean and resellable, he might give you at least a partial trade-in on them. IMHO, it would be worth it, to get the use of a WDH.
Bill
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