Hanra, did you get to the bottom of this? I think LH and LX wiring looms are different. My LH SL/R 5000 runs through the engine mount and back of engine under extractors, however my LX aftermarket wiring loom appears to want to sit next to the rocker cover (not long enough to connect running under the exhaust (which don't sound too good a location for a race car at any rate.
Let us know how you went.
Can't even find any decent pics on the net.