Replacement push buttons for hafler?

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A couple of the black push buttons are missing from a Hafler DH-110 I'm working on. These are black, about 0.30 inch o.d. with a square hole in the center. I could probably get some black ABS rod and retrofit, but if anyone knows a source let me know. Buttons of this type were pretty common on communications equipment back in the 60's and 70's, but the only ones I had in the junk box were white.
 
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