Rack pack header cards - were they the same or different for 75 and 76 baseball?

dtkk49a

I see these are headers with white backs and headers with gray backs. We're they both used each year or were the gray backs specific to one year?

grote15

No, they were different. Headers on 75 racks have a white back and header cards on 76 racks have a gray back. In addition, the product code on a 75 rack is 1-034-93-01-5, while product code on a 76 rack is 1-034-93-01-6.