I got it from a forum member that has not been active here for some time now. Seems like it should be pretty easy for a carbon fiber shop to replicate.
When you consider the cost of carbon fiber options for new cars to the actual weight saved, it makes a lithium battery seem like a great deal. Braille offers a lithium group 25 battery that they claim will fit.
Looks like a new option for rear tires will be available soon.
https://press.pirelli.com/pirelli-a-new-p-zero-from-the-collezione-range-for-the-ferrari-enzo/
I ran a Tilton carbon clutch capable of holding 2000 HP on another car. While it had very light peddle pressure, engagement was like an on off switch. Would not recommend for street use.