Timber,
For what its worth, I changed out the turnbuckles on my B7610 for the telescoping links about a year ago. I believe the lower link arm geometry and size is similar between the B7800 and B7610. Since I am always changing
3PH implements, it was one of the best upgrades I have ever made!
Paid about $130 for the telescoping parts from my dealer. Very easy change over.
Hope this helps.
Dave