Hello, i have recently bought a 1986 505 Diesel Family with a mixed bag of wheel nuts fitted to it and on one rear, wheel bolts instead of studs and nuts, my questions to you all is which wheel studs do i need for the rear axle fitted with brake drums 30mm or 38mm length, also the car has steel wheels fitted and has a mixture of normal nuts and the ones fitted with the captured oval washer, which one is original or best for 1986 model? Thanks Steve