7 1/4 pinion seal help

So I am slowing fixing my cooling problems but I need to drive it 3 - 6 hours to flush the motor so I get ready to take a short drive last night. I pull the car ('65 Barracuda) out of the garage & park it in the driveway. I go to check to see what may have leaked on the garage floor. The usual tranny leak spot is there along with a new power steering leak & a gear lube leak from the rear end. It appears the pinion seal is now leaking, yay! :angry7: It is a 7 1/4 boat anchor. I am hoping to find out what size bolt holds the yoke on & does anyone know a part # for the speedy sleeve? Napa carries them but they do not have a listing for my car. I am not sure I need one but figured I would ask ahead of time. Also, what tool do I need to open the fill plug on the diff. cover? Thanks for any help.
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