How to tell a MUTTs age? (A2)

My first one had the VIN painted under the hood which had the date in it. It is a '71 Ford. The second one has AM General on the valve cover. No other tags or numbers. The third one has a different bumper (straight) and no label on the valve cover or anywhere else. Any other factors that I can use to determine age? Thanks

Contact Ken AKA Muttguru. He's on G503 a lot. He is VERY helpful.

Ok, I found the plate on the trans tunnel and here are the numbers. 11639700 C151-11303

I found the vin # on the trans tunnel. drivers side between the gas pedal and the drivers seat. You night have to move the fuel and breather lines and then feel for it. It's under a clip that holds the lines to the side of the tunnel. This was for an a2 There is also a tag on the trans itself. accessed when you remove the top panel

The tag on number 3 is C151-25313

I got with Muttguru and found out that number two is probably a '77 and the third one is a '79. That's what I am going with. Thanks