the Hurst Baja Boot is still around, once owned and raced by Steve McQueen in the Baja 1000, and it's current owner, Jim Glickenhouse, says he is planning to build and sell a modern version by 2020

https://www.roadandtrack.com/new-cars/future-cars/a19057557/jim-glickenhaus-baja-boot/
http://www.thegentlemanracer.com/2018/04/steve-mcqueens-baja-boot.html