Cheap BMW 8 Series Steering Box

No — the BMW 8 Series (both the original E31 generation from 1989–1999 and the modern G15/G16/G14 generation from 2018 onwards) uses rack-and-pinion steering, not a steering box. A steering box is a recirculating-ball or worm-and-sector unit typically found on older, heavier vehicles such as trucks, vans, and some classic cars. The part you are most likely looking for is a steering rack.

You need to search for a steering rack (also called a steering rack and pinion assembly) rather than a steering box. On the E31 8 Series (1989–1999) this was a hydraulic power steering rack, while the G15 coupe, G16 gran coupe, and G14 convertible (2018 onwards) use an electric power steering rack. Make sure you tell the breaker which generation and engine variant you have, as these racks are not interchangeable between the two generations.

Both of those cars fall within the single E31 generation (1989–1999), so there is a reasonable basis for compatibility, but confirm with the breaker against your exact registration before purchasing. Engine size can influence steering rack specification on some applications, so let the breaker know whether your car is the 840Ci or 850Ci, as well as whether it is a manual or automatic.

Trim level does not determine steering rack fitment on the 8 Series — what matters is the generation (E31 or G-series) and the engine variant. The breaker will need your registration or VIN to confirm the exact rack fitted to your car, particularly across the G14, G15, and G16 body styles which share the platform but differ in weight and configuration.

The G14 convertible, G15 coupe, and G16 Gran Coupe are all part of the same modern 8 Series generation launched in 2018, and they share a common platform, but body style and weight differences may affect rack specification. This is something you should confirm with the breaker against both donor and recipient registrations rather than assume interchangeability. Never guarantee fitment based on generation alone.