Citroen part number 95 566 670.
For 2CV or Dyane: It has the mounting hole for the accelerator pedal pivot, so is intended for later models (mid '70s onwards), but will also fit earlier models with the floor mounted accelerator pedal. It is not suitable for 50's/60s models that have the chassis-mounted pedal-box, without major alterations.
This part is no longer available from Citroen, or anyone else as far as we know. It is a new, old stock part, that has been lying around in a Citroen parts store for a long time. We only have one!