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Evan P.
Are these suitable for US DOT standards or for European roads only?

These are designed to meet European standards and do not have the necessary DOT markings for legal on-road use in the United States
Ferey F.
Is there an adapter to fit a 9004 bulb onto these? Are they H4 types?

No it does not. It accepts an H4 bulb. Thanks for your inquiry.
Gary W.
Are these a direct replacement as to being able to replace an existing housing with these e-codes?

Yes, The difference is that the pattern of the beam is for Europe standards, so you do not blind the oncoming trafffic
Aaron G.
Is the lens plastic or glass?

The lens is glass. Thanks for your inquiry.