Vintage Cars: 72 monte carlo, vin numbers, cat id

Question
Where are the location of the vin numbers on these cars? If you do not have the origanal dash?

Answer
Other than the dash, the location of the VIN has changed over the years, even on the same brand of car.  Unfortunately, I can't know all of them.  You need to find a website like this one:

http://www.americaniron.net/forums/default.asp?CAT_ID=218

There are others; a brand-specific forum like this is the best place to ask a model-specific question like this.