I have a rockshaft for a NF tractor w/electric lift (100% positive) on my 100, and the dimension you asked for measures 2 5/8" on my rockshaft. From the pictures I have, it looks like the center of the tab that the cylinder attaches to (on the rockshaft) matches up with or is very close to the outside face of the tractor's framerail.
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Mike - Ramsey, MN
'65 100 - #126432
Options: V61's, 8.5" Tru-Powers, stock sleeve hitch, Xtreme sleeve hitch adapter
Attachments: Dad's 42" Dozer Blade & 38" 3-spindle deck, 42U deck, Homemade Sleeve Hitch Dethatcher & a QA36A Snowthrower
Mods: K301 Upgrade, IHinIN's clutch pivot upgrade, SST driveshaft, custom bar axles
"Why buy something shiny & new when you can save something old."
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