Will these work on my factory mirror without modification?

They'll fit, but modification is required for installation. If your vehicle didn't come with factory mirror signals, you'll need to adapt the housing or wiring to the existing mirror cavity.

Do these come with mounting hardware and wiring connectors?

The assemblies are included. Confirm what fasteners and connectors you'll need by checking your mirror housing before ordering—contact support with photos if you're unsure.

Can I use the sequential and puddle light features at the same time?

No. Switchback means the LEDs toggle between amber (sequential turn signal) and white (puddle light) based on what function is active. They don't run simultaneously.