When the Ford item is in excess of £300 this is obviously a bargain and seems to be of OEM quality.
The trick is to diagnose what is wrong with the cars dpf system. If the dpf is blocked because the vaporizer is not working then just fitting a new vaporizer will not fix it as the dpf needs to be unblocked so that a regen will work. Look at dpf cleaning on youtube. I believe caustic soda will do the trick, for this however the dpf has to be removed. good luck.