I found this hydraulic top link at http://www.agrisupply.com
item # 67464 HYDRAULIC TOP LINK CATEGORY 1, 2" X8" STROKE
This one has a tang on the base end. On my B7100, the top link is mounted between the bases of the ROPS, and needed the extension.
I'll run it from the directional control valve and post pictures when I get it installed.