Unable to buy the bone shaker car to complete the event 
I cant access it either.
Why…is it because you dont have enough forzathon points ??
i had no problem getting the car from the frozathon shop and using it. maybe try again?
restart the game, or re-open the forzathon shop. I’ve seen the Twin mill in the shop before i was able to get the bone shaker
I think they are talking about when they go to the seasonal event where you have to use the bone shaker. When the menu comes up to select there car you can usually go to buy car and all the cars in the auto show that are useable on the event show and you can purchase the car from there. However the bone shaker isn’t in the auto show so nothing shows up.
The event is not bugged you have to buy the car from the forzathon shop.