[SWEDE_Mach1]

Some time before the door was replaced on the 69 Mach 1 so the numbers dont match, is there any way of knowing these numbers?, and getting a replacement tag?

[70Mach03]

Yes, Go here: http://www.martiauto.com/

Using your VIN you will get a report that looks like this :

http://martiauto.com/images/report-dlx.gif

There are vendors that will reproduce the tags for you if you have proof of ownership.