The Lower Casing - Drive 4 (l150/l200) assembly is constructed from several parts from which the Propeller (3x15-1/4"x19"-ml) is the most expensive.
A sample from the products for the Lower Casing - Drive 4 (l150/l200) include: Bolt, Washer Based(6a3), Water Seal 1, Tab-trim, Washer (6e5).
On this parts fiche the Bolt(64d) is the most specified component.