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John -
I have done that type replacement, and have rescued one from a boneyard.
(1) Three-section or five-section is irrelevant, the diameter is critical. Get your source to cough up the right size.
(2) The other critical thing is that the nylon gear must be absolutely straight for the last 15 inches for it to slip down into the area where the motorised gear will catch it. The tube that the mast collapses into has a flat bottom with a hole in the center just big enough for the nylon gear, so if it's "curly" it will go down the side of the tube and stop on the flat bottom off to one side.
(3) I have been successful at installing a Volvo p/n 3533568-6 mast replacement, the instructions were quite good. I used a jerry-rigged wire connection in the trunk instead of having a helper turn the radio on and off. The wiring is such that of the two in the connector, black and green, neither is ground. If the green is hot, the mast retracts. If both the black and green are hot, the mast extends. Test it with the unit vertical, if it's horizontal it will seem to fail. DAMHIK
Good Luck,
Bob
:>)
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