I'm surprised by this posting since I've used Shure "rubber donuts" for, I dunno, maybe 35 years without any squeakage. They're a terrific design in my opinion--highly effective and almost stupidly simple.
The only thing missing is some kind of cable fastener so that a loop of cable can be "pinched off" and isolated. But the usual plastic spring clips on the boom and stand take care of that quite nicely.
Can you explain what, exactly, caused your squeaking? Were you repositioning your microphones while recording? That's always a high-risk maneuver, not to be undertaken lightly (like traveling the Jundland Wastes).
--best regards