Vertical Sliding Window in entry door

They were an OEM option. Have one on my 78, had one on the 77. Since the door & galley windows on GMC 26 ft interiors are the same, the optimum thing would be to have one each for cross ventilation. May be able to find one from parts coaches.
 
It was a factory option starting in 1975. Contact Sirum or Applied to purchase a used one depending on the side of the country you are on.
Thanks. After reading Jim Bounds sliding window repair article, he pointed out “late model” which would suggest 77-78. I have only been to 1 GMC Rally and haven’t seen a whole lot of GMC’s to know how they differ other then a few mechanical differences.

Update: Per a conversation with Nick, Applied GMC is currently moving to San Jose so any parts searches are on hold.
 
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I pulled one from our 78 Palm Beach parts coach. There was a similar one in the "kitchen". The wife is looking forward to having a nice crossflow breeze while cooking.
 
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