I have Richbrook lockables on front but don't fit the rear because the rear tailgate has steel threads as opposed to fronts self tappers.
So as per the norm the little plastic surrounds around both rear screws have cracked, yellow one shows the most.
Where can I get these from or better ones ????

Well you can get numberplate screw sets from Halfords and they inlcude the screws neeeded and the coloured caps.

Well mine fitted Maybe the threads knacked now!