With a quantity of three pieces, the Bolt 6x20 is the most used part in the TAILLIGHT ('79-'80 A3/A3A/A4) diagram.
The Kz1000a2 Kz1000 1978 Canada Taillight ('79-'80 A3/a3a/a4) consists of seventeen pieces with the Tail Lamp Assembly being the most expensive.
A sample from the products for the Taillight ('79-'80 A3/a3a/a4) include: Damper Rubber, Damper, Collar-battery Case, Tail Lamp Lens.