Missing a part for a 601 movement

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I believe I am missing the round plastic piece that goes between the movement and back plate. Does anyone know where I could find one? Also is there a specific name for it? Thanks

 
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Caliber 601 was used in many models.

What is the reference number of the watch?
 
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It should be stamped on the inside of the caseback.

Something like 166.0123
 
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Gasket? The seal? If that is what you refer to, it shouldn’t be hard to find. The surface of the case where a gasket would fit is quite rough (corroded), and sealing the case will not be possible.
 
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Not the o-ring. I think there was a plastic ring that pressed against the caseback and movement to help prevent the movement from moving in the case.
 
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to help prevent the movement from moving in the case.

The movement is secured by the two steel tabs that engage in the annualr groove in the case wall.

 
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The movement is secured by the two steel tabs that engage in the annualr groove in the case wall.

The movement is secured to the enlargement ring (movement spacer) but the spacer is free inside the case.

There is no plastic part for this case, but I do see a spring identified:

085ST0001 | SPRING Ø 0.25​


No photo so I'm not quite sure what this is, but my first thought is that there is a wave style spring inside the case back that presses on the movement spacer to keep it from moving. Other than that, the case back itself would have to press on the spacer to keep it secure.
 
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Yes, I am missing the wire that is on the caseback. How could I obtain one. Thanks!