I don't think there is a source.
When I restored my '64 post car, I tried several vendors, including salvage yards with no success. I ended up using the original channels, which had very bad cushioning inside the channels.
This is frustrating, since all the GM A body sedans used this same channel. For the window to be operational, this channel is mandatory.
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BONESTOCK GOATS
'64 GTO Tripower Hardtop (Wife's Car)
'64 GTO Tripower Post Coupe (My Car)
'99 Bonneville SE Sedan
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