This part is thought for the LST1 but works with the LST2, Mega Baja and Aftershock. You need only 2 of them for the LST2, though. I bought this part 8 months ago and using two them in my LST2 with the other 2 in spare. Luckily, I didn't have to use the spares yet. The ones I'm using are slightly bent, though, so 4 stars.
It's a nice upgrade if you want to get the truck as light as possible and as durable as necessary for racing conditions.