I have to agree with oosik --- there is something else going on we don't know about. There are standards for 3pt hitch geometry and heaven knows ALL the manufacturers know those standards and it is really hard to imagine they do not comply. Maybe the tractor(s) did not come with lift arm extensions for ease of hook-up and you added some ? Maybe the tractors had been custom ordered for some particular application ? Maybe your implements are oddball or have links missing or modified? Just something missing in all this. Maybe you got both tractors from the same source and that dealer has a habit of supplying short top links -- seems far fetched.
As others mentioned you can definitely order hydraulic top links with a wide variety of stroke lengths, over all lengths, etc. I have not tried, but very little question you can buy top links with either more adjustment latitude or longer over all to start with, etc. And the homebrew adapters obviously will/do work to move the top link attachment point outward. So in that sense your problem is solved.
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However, for my 2 cents worth, I'd first find out what is not meeting the industry standards for 3pt hitch geometry.
The ISO standards are at
https://www.iso.org/obp/ui/#iso:std:iso:730:ed-1:v1:en but somehow they think they can charge money for a full set oif stds. The Wiki at
Three-point hitch - Wikipedia is informative. So is TractorData commentary at
TractorData.com - Three-Point Hitch .
There are rather extensive dimensions and parts listings for a variety of 3pt systems at
http://www.ricksagparts.com/3-Point_Linkage.pdf
Strangely with 10-15 min spent on the web I cannot find the standard for the top link LENGTH. That might be because of assumptions that they will be both variable and available in a wide range lf lengths (?) Puzzling.