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Apparently the plunger is intended to be replaced with gear reduction starters because most of the solenoids offered do NOT come with the plunger.The plunger as you call it , is the iron piece that is pulled by the magnetic coil pivoting the Bendix to engage the starter. It is not replaced usually.
That's not what I said. The solenoid is not considered a repair item, GM says to replace them if needed. You can repair or replace the starter. Motor and or gear drive.
This is a complete solenoid if that's all you need. With plunger contained. See the blue ring and tab. If you don't you may be colorblind. See item number 19 on diagram.