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Truck doors work fine on a Blazer.
In fact that is what the factory did (they cut down Truck doors).
If you buy a Factory Assembly manual it has diagrams of where to cut. Some people have scaned them if you do a search I am sure you will find a pic.
You also have to make sure you move the reinforecment plate for the door latch to the truck doors (the body of a Blazer flexes more than a truck and these keep the door from cracking).
I have a set of doors from my 72 K5. They aren't perfect, but they are pretty complete and in very repairable shape. I can give you pics if you're interested.
Triaged,
I have some truck doors in good cond and I was going to cut them for my Blaze. I remember someone posting the bluepritns like you say, but I did a search and couldnt find them. I wish I could though.