Cooker door washers

Hello all,

Got a Lofra oven – bought prior to them going bump in the uk.
The handle has Fallen off it and, from what I can tell it is attached via some washers on the inside of the door, and a screw in the handle . My plan it to replace the washers which have misshapen and hopefully avoid a big bill or a new cooker. My question is do I need to buy special heat resistant washers or will simple metal ones do the trick?

Thanks in advance!