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I'm sure there are others but click on ARMCO at the top of this page and then goto colt parts. $10 for 4. Sometimes when the bushings are removed from the frame the frame threads are damaged and you may need oversized bushings and the frame may need to be retapped. Talk with GUNNAR he can help.
Guys generally wouldn't "need" to replace grip screw bushings on 1911's if other guys would over-tighten the grip screws to begin with. Can't count the number of grip screw bushings I've had to replace over the years on newly acquired 1911's where some bone-head had over tightened the grip screws.... Maroon's!