This Outer Plate & Fixing Bolt can only be used with Shimano Ultegra RD-R8000 11 speed rear derailleurs.

If the correct Outer Plate & Fixing Bolt are unavailable you can also use the plate & bolt from the following rear derailleur:

SS Type "B Match" Shimano Dura-Ace RD-R9100-SS GS Type "B Match" -

"B" match indicates that the parts are usable, but differ in materials, appearance, finish & size etc.

Genuine Shimano replacement part.