If you have Sh**mano shifters or any SRAM shifter that is NOT X__ or odd numbered (3.0, 5.0, etc), you need a Sh**mano 2:1 pull derailleur. If your shifters are SRAM X__ or odd-numbered, they are 1:1 pull and need a SRAM X__ or ESP derailleur.
Hopefully someone can come through. If you get stumped, though and don't want to spend a whole lot of money, the short-cage Sora road derailleurs are usually pretty cheap (like $20-30-ish).
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