These are pattern T20 Tiger Cub lutch plates, which are sold individually. They fit the later models with a duplex chainwheel. The lining on these plates is slightly thicker at 1.2mm than the original linings which were approximately 0.8mm. You can either have these skimmed slightly or maybe can use one of your old plates with two of these new ones. Unfortunately I am not aware of any plates being manufactured at the moment with the correct 0.8mm linings.