Josh in NorCal

I have a 1984 truck, 22r and because I'm selling it a lot of people off Craig's List are asking me what the numbers are on the radiator mount on the left side. I can't find any numbers. However, I did take out the radiator in order to make room for working on the timing chain and someone stole it. I can't imagine that if it were an important set of numbers it would be removable. Some of the callers have said it was to identify an original truck, or truck part? Any help locating the numbers would be great, and any help with explaining why the numbers are or are not important would be appreciated. Thanks for answering!