Bilsteins are like this;
For all e23, e28, 32, 34, maybe the same for e21 and even e26 (M1).
M1 came with Bilstein Sports standard.
Rear
- all monotube design
Front
- Touring Class is monotube
- HD and Sport are a dual-tubed cartridge (and it's easy to tell as the base of the outer tube can be removed without depressurising the inner tube).
Boge/Sashs are all monotube construction. I don't know about Konis... monotube too? Monotube is probably better overall (lighter and faster heat-dissipation) and cheaper. Maybe dual tube is better when you are making them in lower numbers.
Nick
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