The Gs400 1979 (n) (e01 E02 E04 E17 E18 E21 E22 E24 E25 E30 E34 E39) Optional consists of nineteen pieces with the Gasket Set being the most expensive.
A sample from the products for the Optional include: Lever,tire, Suzuki Moly Paste, Grease,pbc For Brk Pad 20g, Bond 1104.