Wireless Keyboard (Barrow in Furness)

I am looking for a wireless keyboard approx 14.5 inches (36.8cm) long by 4.5inches (11.4cm) in depth.
It is to go in the space where the original keyboard was on a 17in laptop.
At the moment, I have borrowed my mates apple keyboard, but as you can see in the photo, it is a bit small to fit the gap.
I would get one from Ebay, but those I have seen have keys missing.
Thanks for reading this.