Hello Gang! One of you will surely have an answer to this:

On my 2005 E320, with Bi-Xenon headlights:
615 BI-XENON HEADLICHT W.ACTVIE CURVELIGHT RIGHT-DRIVE

With bulbs out on both sides, I've recently replaced both Xenon low beams and the halogen (H7) high beam bulbs. All four working. But, along the way:

Both of the tiny bulbs within the high beam 'canisters' are dead. Pelican forum notes call this: the front driving light bulb (this bulb illuminates the high beam capsule) - having removed it, this is a 4.9 W tiny bulb; looks like a '168'.

Can this bulb be replaced with generic LEDs, without throwing any CANbus error? I'm encouraged that there is no error seen with both of the original bulbs dead.
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OK - Answering my own question here: No, the LEDs are a no-go. They flash intermittently - presumably resistance is too low. Replaced with Standard 5W incandescents.

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'83 300 SD
'05 E320 4Matic
'06 BMW 530 xi
'68 Triumph TR 250 - The only car I ever loved more than the Mercedes; who needs electricity, anyway? - Damn, why did I sell it?!
'59 Jaguar 3.4 'Le Chat Noir' - Damn, why did I sell it?!

It's difficult to make predictions, especially about the future.
- Niels Bohr