If the e38 doesnt have existing heated seats I think you have to run the wires.

I need a gray rear seat bottom for my X5. P/O put a lawnmower battery on it, and who'd have thunk acid did not agree with the leather.

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740iLDUKE
01' DINAN 7 S62 Swap - Stratus Grau
(1587 produced in SG 440)
02' 4.6is DINAN X5 S2 Supercharged
833/3258 produced | 1/27 Dinan X5's