Apologies for the poor photo quality below, but i need to find this replacement part for one of my bikes.
Its from the front derailleur and it is the part that clamps the cable to the derailleur. Its a Sram mech, as it has the groove in the back plate.
On a tangent i asked a mechanic in Evans who suggested a Shimano bolt and washer would work and he was ultimately offended when i suggested that isnt compatible with Sram mechs...
If anyone knows where I can find this part I would be most grateful.