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Mike C
We know that the pickup, Suburban/Panel & Blazer/Jimmy lower doors are all the same on the lower portion that it only requires the removal of the top and rear portion of the upper door pillar to turn a Suburban/Panel or a pickup door into a Blazer/Jimmy door.
The reason our manufacturer requires the original Blazer/Jimmy door's complete with hardware is they make a fixture jig using a original door so that during the manufacturing process the upper door pillar is inserted into the lower door shell portion at exactly the correct angle and height so that every door manufactured is exactly like the original GM doors. By using the fixture jig during assembly this ensures that every door is exact. We also realize that all internal pieces such as vent window assembly and regulators are the same. By keeping these parts on the door when creating the jig they can make sure that the front pillar is not bent or deformed.
GMCPaul
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