Do these mount at the factory bolt points or do I need to drill?

These mount at the factory attachment points — no drilling needed. You're swapping out the old unit and bolting the new one in the same location.

Does this come with a bulb?

The assembly ships without a bulb installed. You'll transfer your existing bulb or source a compatible replacement before installation.

Are the connectors the same as stock, or do I need an adapter?

Connector type is not specified — test-fit the assembly before committing. If the connector doesn't match, you may need to splice or use an adapter harness from a local shop.