Don't know the Liberty brand but most resonators use maple sadles, can't tell you why but with nearly a 100 years developing these guitars I'm sure there's a reason.
John Pearse Strings makes a very nice string serial # 790NR Phos Bronze spanish neck resophonic they go from a .013 to .056. very nice sounding string with very good life.
Can't help with the split saddle I'm afraid.
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Steve
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