The door windows & regulator with the guts from the 69 GM A-body and 69 Grand Prix are identical. The difference is the door latch that is bolted to the door. is different from A-body to Grand Prix. Same holds true with 1970-72 GM A-bodies & G-bodies... they are the same, BUT I don't think you can install the window, regulator and guts from a 70 into the 69 shell unless you modify the bottom of the door. The 70-72 has a pole that the window track rides on and I don't think the bottom of the door has that provision. Now I'm sure you can make ANYTHING work with a hammer and a welder but... If you are going with 70-72 doors, the 70 door is slightly different than the 71-72. There is a reinforcement piece at the top of the 71-72 door that the 70 door does not have. Also, the 69 door has a different inside release, so you will have to swap things over to the 70-72 doors and remove the 70-72 door release mount. Hope that helps... Gp Mike
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