Sliding rear window gasket?

[FireTruck1984]

Original Factory Sliders

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Solid Glass and Aftermarket Sliders

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[AuroraGirl]

Yes,.. your photo shows a Factory Slider. Notice it doesn’t have the wide aluminum frame like this aftermarket slider.

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A LOT of GM windows had aluminum trim. Infact, it was the possibility of a large portion, as a bunch of trucks with sliders were higher trim, higher trims got bright trim usually. Its not a 100% 1:1 becausee of the 80s changed that a bit, but my 1980 is a FACTORY like that, but it is different, ill show you

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Infact, that may be a factory copy you just posted, with a lockstrip (if its not an OEM one)

 

[AuroraGirl]

WBL 1135

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These are just the window seals, but whats being looked for is the seals of the window itself. The window to the cab is not what most people are needing. Mines fine.

But the actual seals for the sliding mechanisms. but if what you say about the glass and windows on the 80s vs the 70s is true, this is hopefully a good sign with the previous brought up kit which does have the seals