Have located a leek and removed the bolt which conects the metal return pipe from turbo to header tank. There should have been two washers one each side ,but there was only one

I now have the said washers but apparently there are no gaskets .

just wondering if ther is somthing the profesional peeps use to seal metal on metal,or if the washers do the job??
PS right fook on getting the bolt out (only have a adjustable big enough )
All help appreciated