Need Help Finding Blazer VIN #

[penr0295]

I have a 1972 Blazer that has been in my family since it was new, and was custom ordered by my father from a dealership. At some point in the late 80's or 90's the Vehicle ID plate on the driver's side dash went missing. I still have the VIN plate on the driver's door pillar, and althought I had the truck painted in 1999 and had peeled off the glove box door VIN decal/sticker at that time (in order to paint the inside of the glove box door), I did save the sticker itself.

However, it is the missing dash VIN that is giving me grief now that I have moved to CA and am trying to register it here. Can anyone tell me if there is an ID# stamped on the truck's frame that correlates to the VIN? I can find a rather long number stamped on the frame, but it bears no resemblance to a VIN number. I would like to find some kind of definitive proof that this vehicle belongs to me before I make the trip the Highway Patrol office in Wednesday, but really don't know where to look to find it.

Thank you
Tom