Planted Seat Bracket - BMW 3 Series (E21, 1975-1983) - Driver/Left
This Planted driver-side bracket gives the 1975-1983 BMW 3 Series a rigid, vehicle-specific base for an aftermarket seat, with no floor modification. Construction is 3/16" laser-cut steel, hand-welded and powder-coated black, with Standard slider patterns. It's a clean way to add modern support to a classic build.
| Part Number: | SB128 LEFT |
| Manufacturer: | SB128DR |
- Fits 1975-1983 BMW 3 Series (E21), driver/left side
- Laser-cut 3/16" steel, hand-welded in the USA, black powder coat
- Pre-slotted for most major slider patterns, with room for custom drilling
- Standard bolt pattern: includes the Recaro slider pattern. Cobra Wide and Scheel-Mann sliders need one hole per slider elongated 1/8"
- Bolts to factory mounting points, no floor modification
- Fits the 1975-1983 E21 BMW 3-Series
- Sold individually. The passenger side is SB128PA
- Not an FIA-homologated seat mount. Confirm acceptance with your sanctioning body before competition use
Disclaimers:
- Seats come in many different shapes and sizes, so not all seats will fit in all vehicles. It is up to the end user to determine if the seat will fit before ordering the seat bracket and other components.
- Many vehicles have the steering wheel offset toward the center of the vehicle. This can be accentuated when installing an aftermarket seat of a different size than the factory seat.
- Replacing a factory seat with an aftermarket seat may cause the vehicle's warning indicators to activate. This can be due to airbag, weight and/or other sensors in the factory seat that are not included in an aftermarket seat. It may be possible to eliminate these indicators with an electronic resistor, but it is up to the end user to determine if a resistor will work and which resistor to use.
- Professional installation is recommended.
Putting a modern seat into a 1975-1983 BMW 3 Series is one of the best upgrades for a vintage build, but the original floor was never designed to carry one. Fabricated mounts rarely end up square, and they're hard to undo. A vehicle-specific bracket solves both problems.
Rather than working from a drawing, Planted develops each bracket on the car itself. The result bolts to the factory seat mounting points with no floor modification. The bracket is laser-cut from 3/16" steel, hand-welded in the USA and finished in black powder coat, and every unit is checked at three quality-control stages.
Pre-slotted hole patterns cover most major slider brands, including Recaro, Sparco, OMP, Cobra, Corbeau, Momo and NRG. This Standard bolt-pattern version includes the Recaro pattern. Wide Cobra and Scheel-Mann sliders need one hole on each slider elongated by 1/8". If you'd rather delete the sliders to lower the seat, there's room to drill for a direct mount or side mounts.
This is the driver/left bracket, sold individually. The passenger side is SB128PA. Confirm your seat's dimensions against the cabin before ordering. Removing the factory seat can trigger airbag or occupancy warning lights, which may need a resistor. Professional installation is recommended.
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