I have a very similar issue. I've got a
L5740 that I put Pat's on. Had to order a longer TL. I just got an
M7060 and plan to put Pat's on it.
I figured someone must have figured out a good solution and found this thread:
http://www.tractorbynet.com/forums/attachments/105421-extended-top-link-pats-ezchange.html
I am learning to weld and this looks like a great project for a beginner. I've a friend that owns a shop and he can cut the steel for me.
I'm surprised that these adapters are not readily available.
OP, the factory TL on both my tractors has one end that is cat 1, the other is cat 2. The pin attaching it to the tractor is cat 1. If using on a cat 1 implement, a bushing is required. The longer TL I ordered (off Amazon) is cat 1 on both ends. It works with almost every implement I have. My disc requires a cat 2 connection but, luckily, the factory TL is long enough for it.
Some measurements I recently took:
L5740 factory TL = 21.25 - 33
Replacement claims 29 - 39 (I didn't take it off to measure)
M7060 TL = 19.5 - 28.5
I've recently ordered hydraulics from Fit Right. Looking forward to the convenience that will offer.