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Thanks Renee! That is exactly the part I was searching for. Now that I know it's called a washer...
Trying to put an image here:
If the image shows up, you can see (on the edge) that it's tapered. When installed between the derailleur and frame, this taper can correct an angled front derailleur.
'09 Trek 7.3 FX hybrid / Jett 155mm
'09 Cervelo P3 TT / looking
'11 Cervelo S3 road / Selle Royal Seta 155mm
Ischial tuberosities: 140mm center to center