The RTR car has original lenght wishbones and 3 holes, it caught me out almost (when i bought a 2nd hand ZX5, it had SP hubs and RTR arms with proline axles). It wasn't until i put my new car next to my RB5 that i noticed this as my RB5 has the worlds rear end and proline axles, my ZX5 was a half Inch wider than it. The arms are the original length and the shock holes are in the same place, the difference is in the distance between the shock holes and the hub holes. I have to hand an RB5 kit arm and an LA243 'mid' arm and a kit ZX5 arm and an odd 2 RTR arms and put together i can see the RB5 arm is the shortest, then the 243 arm and then the ZX5 kit and the RTR arms are the same as each other but longer than the rest the holes all line up, the RTR arms have the holes in the same place as the 243 arm. RB5 arm is 2mm shorter than 243 arm and the ZX5 kit and RTR arms are 4mm longer than 243 arm.
HTH SimonW
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