Explain the 300 dollar shock to me, What the... Options

[emerygt350]

An insert for 275? What and why? Is it just rarity? Some strange one off design that no other car uses?

[wonkipop]

i'm seeing something else interesting there too.
which is the bilstein set up for the 4s as an option marked M.
with a whole different part number from the one in the PET for the 4s with boges.
and its got a part number first part same as 6, except last two numbers different.
i guess for the different spindle steering arm details compared to a 6.

which kind of indicates what i was guessing about how these components arrived at the factory for the production line.
the boges would have come as a complete suspension unit from boge factory.
and the bilsteins from billstein factory.

there must be 4s with the option ticked that have those struts with a number and markings very close to what chmillman has on his car, but different last two numbers.