Where can you find production data for 1987-1988 Broncos?

It should be on the door or on one of the door post if it is not on the door, chances are it missing, you can look in the motor caparment, but the tag in the motor caparment would only tell you motor info. If you have the owners manual it will tell you in there, if not you can go on the internet to a search engine and look it up there should be some information on there...