If it has the Lucas DKX2 distributor then the points from the Sunbeam S7 or S8, which uses the DKX2, will fit. Stewart Engineering, the S7 – S8 specialists, for them. Good to deal with and have stuff for the Lucas 70 watt pancake generator as well. The S7 – S8 used that too.
The DKX4 was apparently popular on pre war, the big one not the great one, English cars. I know little of cars so I do not know what type of car.