I can't say that. I can say on a youtube video I saw, current dual sports/ dirtbikes use them. can't remember if it was ktm 500 or yamaha wr450.
https://m.traxxas.com/products/parts/7793X
https://traxxas.com/explodedviews/E-Revo-VXL-Brushless-86086-4-Transmission-Assembly
Like the final version. Although I dont care for extensions, the final product looks amazing. Gonna teal your trim tecnique also.
Only thing missing, they used to make xd trackstar fullsize wheels in 3.8 that would look badass.