Rear Axle year?

[Johnny_Lamebridge]

Hi guys. I'm a little confused regarding the year of rear axle in my '63. The housing has an "ear" or "lug" cast into the centre section, that accepts a tapered bolt to mount the Panhard Bar. The ear is toward the right (passenger) side of the casting.

The posts I've read here lead me to believe that the rear axle is a '65 to '72. It still has the 6-lug axles, so i think that narrows it down to '65 to '70. Can anyone confirm that please.

I looked for stamping on the axle tube, and I found HA 01 11, which I take to mean 3.73:1, January 11th.

Is there any way to determine the year? Will it even matter... are they identical from thru that range of years?

Thanks in advance.