Mines not a first gen but had the same problem, my 74 boby was trashed. I had a near perfect c10 fleet side body to use. I get alot of people asking where I got the rear window kit
http://coloradok5.com/forums/showthread.php?t=168550
http://coloradok5.com/forums/attachment.php?attachmentid=26240&stc=1&thumb=1&d=1151987798
http://coloradok5.com/forums/showthread.php?t=168550
http://coloradok5.com/forums/attachment.php?attachmentid=26240&stc=1&thumb=1&d=1151987798