1974 Porsche RSR Turbo Carreras
Hugh:
Yes, it's now obvious that R8 was completely destroyed in the 1973 Targa Florio and so played no further part in the Porsche racing department's history.
There were, according to the factory records, four of the 1974 RSR turbo Carrera cars built. The first was 911 360 0576, (R5). That car has now been converted back into its original RSR form by Gunnar racing.
The other three cars were built on the 1974 "G" type chassis and were:
911 460 9016 (R9).
911 460 9101 (R12).
911 460 9102 (R13).
The chassis numbering denotes lightweight chassis, originally intended to be RS/RSR 3.0s.