A fibreglass shell has one fixed lumbar curve and no dial to change it. An inflatable pad behind the velcro backrest cushion gives you an adjustable one for about thirty pounds, and the same trick works on most fibreglass seats.
Bucket Seats
Customer Question: Runners For Recaro Sportster CS Seats In An E82 135i
An E82 135i owner asked which sliding runners mount Recaro Sportster CS seats to the car. The answer: the Planted Technology SB139 bracket at £224.95 a side plus the Recaro double locking runner set at £365.40, and the same stack carries the Recaro Speed.
Seat Bolt Patterns Explained: Every Brand We Sell, Measured And Mapped
There is no standard seat bolt pattern. Every pattern across the brands we sell, drawn to scale: the shared Sparco and OMP holes, the Corbeau double drilling, the Recaro lock, Cobra designed sets, BRIDE rail types and the measurements that settle any seat before you buy.
Customer Question: My Harness Bar Is Right At The Back, Do I Need Longer Straps?
A customer building a BMW track car has his harness bar mounted well back and asked if he needs longer shoulder straps. Saloon length is the default, and it is cut to reach.
The Corbeau Sportsman: A Compact Recliner For Compact Cars
The Corbeau Sportsman is one of the narrowest reclining seats we sell, 41.5cm at its widest. The actual dimensions, real customer cars it has gone into, and the honest limit of how compact it is: the cushion is narrow too, so it is not the seat for a larger driver.