A Planted Technology seat bracket for the Smart Fortwo, second generation on the W451 chassis, 2006 to 2014. Part number SB389.
The smallest cabin anyone will ask us about
Space is not a consideration here, it is the entire problem. There is very little between the door card and the centre console and a wide shell simply will not go in at any price.
Tell us your height and build before you order anything and we will work out which seats physically fit. This is emphatically not a car where you choose a shell from a photograph and hope.
The Tridion cell
Worth knowing: the visible steel safety cell that Smart made a feature of is the structure, and the coloured panels hang off it. That is what the seat load ultimately feeds into, and it is a good reason not to improvise anything.
Why people do it
Weight, mostly. A Fortwo weighs almost nothing, so a heavy steel framed shell gives back a real slice of that. Ask us about the lighter GRP and composite options.
Side airbags are fitted. Tell us the specification.
Have you written anything about this exact product?
Yes, we have covered this exact product: Lexus Planted Technology Frames Updated For 2026, and Customer Car: Subaru Impreza With Corbeau RRS Seats and Planted Technology Brackets. That is first-hand coverage from our own builds and showroom, not brochure copy.
Will this fit my car?
This frame is made for the Smart Fortwo [2nd Generation / W451] (2006-2014). Chassis code and years matter more than the badge, as floor pans change between generations, so if your car sits near a changeover year, send us the registration and we will confirm before you order.
Which seats does it take?
Check the bolt pattern in the specification against your seat. The Compatible seats tab above lists what bolts straight on. If your seat is not listed, tell us what you run and we will confirm the fit.
Do I keep fore-and-aft adjustment?
Only with a sliding runner between the frame and the seat, which is a separate part on Planted frames. If more than one person drives the car, budget for the runner. Our guide to sliding runners explains the options and widths.
Is this for the driver or passenger side?
Both sides are available on this listing, pick driver or passenger side at the point of order (sides listed are for right-hand-drive cars). Left-hand-drive car? Ask us, as the sides swap over and availability varies by model.