For 2008, new chassis designs were allowed to be submitted, with several companies purchasing the rights from existing entries. Lola Racing Cars, in association with Krohn Racing, purchased Multimatic's entry for the construction of a new prototype under the name Proto-Auto. Dallara later purchased Doran's entry as well, with assistance from SunTrust Racing. Cheever Racing purchased Fabcar's license and developed under the Coyote name, with assistance from former manufacturer Picchio.

Crawford DP08 '2008–09

Dallara DP-01 '2008–11

Michael Shank Racing Dallara DP-01 '2011

Riley Mk XX '2008–11

Chip Ganassi Racing Riley Mk XX '2011
Michael Shank Racing Riley Mk XX '2011
Chip Ganassi Racing Riley Mk XX '2011
Chip Ganassi Racing Riley Mk XX '2011

Coyote CC/08

WheelsAge.org '2005–atual