Regarding both the grips and the lanyard swivel, replacements for both are easily found. There are usually some to be had at eBay, and at other firearms parts dealers such as Sarco. However, it really isn't necessary to replace either, as it won't make your revolver any more original nor increase its utility. If I had it, I'd leave it in its current condition, just the way it came from Great-Grandpa.
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