Screen over rear facing camera

I think I may of lent on my Huawei P9 and have cracked the small plastic cover that protects the main dual camera and flash. I note that Huawei's Gold care service only covers the main screen and a guy on the service line suggested that to get this tiny strip of plastic replaced would cost me around £60, seems a tad excessive. Can anyone offer me advice on how or if I could do this myself and if so where could I source the part required?

Many thanks.