XPS12 touch pad Ribbon cable retainer/ ribbon connectors

Whilst trying to fit a new touchpad, I mislaid the small black retaining bit of plastic that secures the ribbon cable into the pad. See pink arrow on this image.

Any idea what this part is called, and any suggested sources in EU?

UNFORTUNATELY, the replacement pad had the wrong number of pins on it, so couldn't be used as in image here; assume Dell changed configuration; my XPS12 is of 2014 vintage. 

Original failing touchpad connector

Thanks