Just wanted to follow up and add some notes to this thread.
If you have an LX2610, LX3310, B2650, etc... series with the Pats Quick Hitch, the correct top link is the one Daferris suggested above. The Sparepartsholland 20 7/8" - 31 7/8" or 530mm - 810mm works with full range of motion for my box blade.
I ground the sleeve and the housing down (misread the instructions in the first post) but I now have near factory fitment. Here is roughly the extension that results in my BB scrapers level front to back.
I need to come up with a solution to hang the top link so I don't have to remove it when it's not hooked up. Maybe some low grade chain wrapped around the factory link hook...
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