I have a slow leak where the water coolant goes to the turbo (banjo connection on the side towards the head).

I seem to remember there are two copper washers on either side of the banjo, can these be replaced with dowty washers ? I have some with nitrile rubber, but not sure they will stand the turbo housing temps...

Either way, do you know what size the washers are, or, FINIS code, so I can get some before getting anything undone ?

Thanks in advance
Greg