Welcome, and interesting problem!
Member @Geezer1 once discussed a Sienna importer in Germany (?) who did the required modifications (sorry, trying to do this from memory). Is this a universal EU requirement, or specific to Poland?
Your idea seems sound, but other than the dual filament H4 I don't know of any other bulbs that contain an internal shield. They are so different from a 9006 that I don't know how you'd get the basic pattern to align. Perhaps an upper shield affixed to the outside of the 9006 glass envelop or fitted to the inside of the Sienna headlamp stationary above the bulb? But how would any of these modifications be viewed by the vehicle inspector? How rigidly to they test?
Member @Geezer1 once discussed a Sienna importer in Germany (?) who did the required modifications (sorry, trying to do this from memory). Is this a universal EU requirement, or specific to Poland?
Your idea seems sound, but other than the dual filament H4 I don't know of any other bulbs that contain an internal shield. They are so different from a 9006 that I don't know how you'd get the basic pattern to align. Perhaps an upper shield affixed to the outside of the 9006 glass envelop or fitted to the inside of the Sienna headlamp stationary above the bulb? But how would any of these modifications be viewed by the vehicle inspector? How rigidly to they test?
