A Planted Technology seat bracket for the Chevrolet Sonic, 2012 onwards. Part number SB181.
Sold in some markets as the Aveo, and closely related to the Opel and Vauxhall small cars of the period.
The RS is the one
General Motors put the 1.4 turbo into the Sonic RS with a manual gearbox and firmer suspension, and it is a considerably better car than the badge suggests. There is a small following for them in cheap club racing in America.
Space and weight are both constraints
A Sonic is small inside and there is not much between the door card and the console, so shell width matters as much as the bracket does. It is also light, which means a heavy steel framed shell gives back a real slice of what makes it quick.
Tell us your height and build and ask us about the lighter GRP options. On a car like this the money is better spent on a sensible shell and good tyres than on the most expensive seat we stock.
Side airbags are fitted. Handed, so order twice for a pair.
Have you written anything about this exact product?
Yes, we have covered this exact product: Planted Technology Chevrolet Sub-Frames: Ready For The 2025 Racing Season. 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 Chevrolet Sonic (2012+). 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.