The E-3 assembly is constructed from several parts from which the Head Comp,cylinde is the most expensive.
Parts such as the E-3: Bolt,stud,6x16, Nut,flange 7mm, Insulator,carb, Clip,valve Guide are included in the Nsk50sh Dio/dio Special 2005 (5) Japan Af62-110 E-3 parts fiche.
On this parts fiche the Nut,flange 7mm is the most specified component.