Voxson speaker

Have installed my Becker euro 11,next step if I want to stay original is to locate a twin to the one speaker I have,I am looking for the speaker and back plate which are all in one piece as you can see from the picture on the right,I have the two cover plates shown on the left I could put these over another set of speakers but I will try and find a partner for the other one first,it has to be the same as it has small lugs for the cover to clip over ,anybody know where I should start looking.
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