Caraluna light cluster

Whilst reversing into my driveway after the last trip out, very tired, dark etc. I managed to crack the outside of the cover on the offside rear lights against the wall. I then managed to run over the piece that fell off so that I now require a replacement cover.  Sadly, all I can find anywhere is the full lighting cluster at full price.  The model is ET1108, and If anyone knows how I could just get the cover alone, I would be most grateful for the information.

Quite a few here 

https://www.google.com/search?q=HELLA+CARALUNA+MK1+MOTORHOME+LIGHT+CLUSTER+2VA+007+502-117&rlz=1C9BKJA_enGB822GB822&hl=en-GB&sourceid=chrome-mobile&ie=UTF-8