That model number is not recognised by the official parts software, please recheck and if possible give us all the numbers you can find on the rating plate.
There are however three different models of FB51. Sadly the decal ( markings ) plate is part of the whole front surround, just over £72.00 :eeek:
All three versions have three control knobs 😉 To make a positive ID we do need the all the numbers from the rating plate which is usually found where the door closes against the cabinet either bottom left or right hand corner.