I always thought from the days I worked at Ford Obsolete in Long Beach, that all Ford axle keys were the same from 1911 to 1948. Apparently not. The early T parts books says 2 11/32 long. I'm using two NOS Ford script axle keys for my '13 roadster, and they are a good 3/8" longer. There is a star on each side of the Ford script, so is it possible they were for a Model A? I have shortened them to the correct length.
I went there when it was on Florence too. I was 17 years old then, and was just learning about T's. Wish I knew then what I know now. I could have gotten a lot of good stuff.
Would the longer keys be for a TT?
TT keys are thicker.
Larry, do the shorter original keys have the taper on one end?
I'm pretty sure I have an old original script key around here somewhere, but haven't seen it in years. As I recall, it had a taper on one end.
If the script ones with the * between the Ford script is A, I don't think so. Have removed these and this 2 3/4" length all the time from Model T rear axle hubs.
The 2816B Rear Hub key length is called out in the Parts & Price List as you noted to be 2 11/32", but that could be an old typo.
For example, in the Price Lists the 2574 U-joint pin is called out at 3/32", but that is wrong, the u-joint pin is 9/32"!
Correct keys have the taper end to fit flush into the keyway, the taper facing down in the axle keyway and toward the housing. The opposite square end is presented to slip the hub onto when fitting.