The Screw is the lowest priced item on this Transmission schematic.
The Transmission is made up of components including this Shaft,drive which is the most expensive.
Parts such as the Transmission: Bearing(17x21x9.8), Shim(17x24x1), Washer, Gear,3rd Drive(nt:19) are included in the Tu250x 1998 (w) (e02 E04 E17 E24 E25 E34 E39) Transmission parts fiche.