thor built in oven

Hi anyone know where to get a second oven shelf for the Thor oven in veg 11 apparments, I find one isnt enough. All the ovens we have had have come with two shelves. Was wondering if we could buy one in England, and take it back with us next time we go, or would we have to buy one in spain, If so where do we buy one?, will another type fit the Thor oven?, any ideas, please let me know if anyone has the answer.  Surely I am not the only one who could do with a second shelf to make life easy when cooking. 

Thanks from  Carol Geoff Jeff Jamie & Adam, the         hopes5                  

Not sure where you are but if you are near Guadamar and the Lemon Tree Market, there is a Spanish hardware stall that sells all the different sizes.  Measure the one you have and they should have one.  If not, many ferritarias have them.  Pat