The standard B6 is also
available in an XL size which is 30 mm wider. Unlike the new B6 XL Screamer,
the lighter B6 XL is not an FIA homologated model, but it is still ultra-rigid.
An externally narrower version is available named the B6-43 XL, with the edges
specially cut to reduce the outer width and allow a larger 100 kg + driver to sit
in a ultra-narrow car. When the outer edge is left on with the B6-47 XL, it
creates a continuous rolled edge around the whole perimeter of the seat.