I have a 73 K5 Blazer and I just received repair parts for the tailgate window (basically everything except the glass:
Tailgate Window Motor, 73-91 Blazer
Amazon.com: Tailgate Window Motor - Compatible with 1978-1986 Chevy K5 Blazer : Automotive
Amazon.com: maXpeedingrods 4220 42-20 Tailgate Window Lift Regulator Motor Compatible for Buick Chevrolet Blazer/K5 Blazer/Chevelle, for GMC Jimmy/Suburban, Rear Window Motor 22010405 5045702 : Automotive
Blazer tailgate window problem. - The 1947 - Present Chevrolet & GMC Truck Message Board Network
Tailgate Window Motor, 73-91 Blazer
Tailgates & Liftgates Brand New Tailgate Window Lift Motor Chevrolet K5 Blazer GMC Jimmy Oldsmobile money-sense.net
Need help finding a part for K5 Blazer rear electric window regulator - TexasBowhunter.com Community Discussion Forums
1973-1991 Chevrolet Blazer/Jimmy Tailgate
Brothers Trucks WR091PW Brothers Trucks Tailgate Window Regulator - Power
K5 Tailgate Window Wiring & Intrernals | Diesel Place
1973-1991 All Makes All Models Parts | 17124 | 1973-91 Chevrolet Blazer/GMC Suburban; Tailgate Window Crank Handle Assembly | Classic Industries
Amazon.com: maXpeedingrods 4220 42-20 Tailgate Window Lift Regulator Motor Compatible for Buick Chevrolet Blazer/K5 Blazer/Chevelle, for GMC Jimmy/Suburban, Rear Window Motor 22010405 5045702 : Automotive
Amazon.com: maXpeedingrods 4220 42-20 Tailgate Window Lift Regulator Motor Compatible for Buick Chevrolet Blazer/K5 Blazer/Chevelle, for GMC Jimmy/Suburban, Rear Window Motor 22010405 5045702 : Automotive
Tailgate Window Motor, 73-91 Blazer
K-5 BLAZER REAR WINDOW PROBLEMS - YouTube
K5 Blazer Tailgate Window Troubleshooting and Repair Part 1 - YouTube
Suburban tailgate power window repair | CK5 Network
Amazon.com: maXpeedingrods 4220 42-20 Tailgate Window Lift Regulator Motor Compatible for Buick Chevrolet Blazer/K5 Blazer/Chevelle, for GMC Jimmy/Suburban, Rear Window Motor 22010405 5045702 : Automotive
Converting a K5 Blazer or GMC Jimmy Tailgate from Power to Manual Window - YouTube
Tailgate Window Regulator Cable – YourOldTruck
Amazon.com: Tailgate Window Regulator Jackscrew Transmission Gear Assembly wth Cable fits Full Size Blazer & Jimmy : Automotive
Classic Truck Parts | mobile/1978 to 91 Tailgate Power Window Cable Blazer OE