3.3.3 Generalities on alternative components:
Alternative components” can either be period components that are not coming from the original installation of the car make (for ex. original components from period suppliers) and replica components (for ex. replica of original components from the car make installation or replica of original components from period suppliers). Alternative components to the original manufacturer’s specifications can only be used if it is proven that these components were allowed by the period Appendix J and/or Homologation Form applicable to the car concerned and, in both cases, used in that model of car in an event entered on the FIA International calendar in the period. Freedoms granted in period by Appendix J do not now confer complete freedom but rather authorise the use of modifications and/or components actually used in period on the particular make and model as a result of those period freedoms.
3.3.4 The period, alternative components, and the extensions of the Homologation Form to be considered will be specified on the HTP applicable to this specific car.
3.3.5 Unless otherwise specifically authorised by these regulations, any component of a car must have identical dimensions and material type must be the same to the original part. Evidence of this must be provided by the applicant.
3.3.6 The technology used, including that allowed with homologation extensions, must be compatible with that used in period.