[Greenlee]

They are interchangeable. I read on here recently that in 1990 they changed the design of the rubber seals to cut down on wind noise. It just so happens that the ones on my truck came from a 91’ Suburban that I had bought for parts. My truck is an 83’. I had never heard about a design change when I found mine, but they work great and don’t leak any air on the highway like some trucks I owned in the past. So if you can find some from a 90’ or 91’ Suburban that would be my first choice.