UM521 comes with an RB5 front arm (it's the RB5-SP wishbones)
LA243 is the "mid rear" conversion wishbone for the original ZX5, it's the same length and the inner 2 shock positions are the same ... I have measured and modeled every Kyosho wishbone for the RB5 and ZX5 range (plus a few others to compare with)
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