Four CJ-5-oriented Questions

Four CJ-5 Questions for you all:

1. Anyone know when (month/year or vin) that the CJ-5 switched from the side tank to the rear? I've seen dates between mid 1970 through early 1972.
2. Similarly, when was the PTO draw bar dropped (month/year or vin)?
3. When did the CJ-5 spare tire mount move from the side to the back (month/year or vin)?
4. When was JEEP changed to Jeep on the side of the CJ-5 cowl (month/year or vin)? (somewhere on eWillys I've answered this question, as I remember doing the research, but now I can't find it!)