06.0592 would be for the early Fastback oil tank.......
https://andover-norton.co.uk/en/sho...-exhaust-brackets-headsteady-battery-platform
Item 38.
.......the 'S' central oil tank has a banjo and a 'bolt' filter.
https://andover-norton.co.uk/en/shop-drawing/489/oil-tank-battery-tray-air-filter-1969-70-r-s-
Items 12 & 14.