Bought the BXT-65-850 it was $10.00 more than 750.
BTW-1 all BXT have 3 year replacement warrantys.
BTW-2 the people that advised me in my original post about failed positive battery terminals being caused by leaking OEM batteries are absolutely correct.
The only reason I bought the Motorcraft battery, is my Expy is under Ford Premium warranty and my intention is to make an issue of this battery leakage causing positive terminal (literally terminal) damage and the battery terminal / cable actually being a $400 power harness, all designed to fail and cost the owner mucho dollars in repairs, none of which is covered by premium warranty.
Id like to know how many others experienced this issue on late model Expys as it might be worth a letter to NHTSB, but to do that you need a fair number of complaints.