UM503 is the stock RB5 rear arm and yes, it is the same as the Lazer SP / FS arm (in LA255).
The front arms included with the LA243 pack are for the original (pre SP/FS) ZX5 and essentialy not a lot of use to most people!
The only way to get the SP/FS front arms is LA255
The only way to get the mid rear arms is LA243
Hope that helps
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