Vauxhall (Opel) Astra "J" cupholder attachment

I am new to 3D printing but decided to put my new machine to good use, I had an after market arm rest that I fitted to my 2014 Vauxhall Astra "J" this was designed to fit in the rear cup holder,

I could never get it to fit, so I measured the aperture and designed a holder that would fit the hole and allow me to bolt the armrest to this holder,

I then was able to use "No Nails" to stick the whole assembly in.