https://www.youtube.com/embed/IpRFagIbcPE
There were no easy-to-mount action cams back in 1956. If you wanted on-board footage, you had to mount a large, heavy camera and rig up a microphone.
Ride along with Mike Hawthrone in a Jaguar D-Type as he gives his commentary of the 1956 layout of the Circuit de la Sarthe.