Originally Posted by quietstorm76
It's really old so I'm not sure. It's out of production. It was made back in 1998 or 1999 I think. I had a Nitro RS4 2 that I bought in 2000. I still have it.
Many of the parts from the RS4-2 will fit on the original RS4. However, is you change one A-arm, you will have to change the other due to the arms being slight different in length (more of where the hinge pin holes are for the C-hub). He could scan ebay to see who has one that can be acquired to be broken down for spare parts usage.