Will this drop into my existing mirror housing?

Yes. This is designed as a direct replacement for the OEM mirror glass — it uses factory mounting points on your existing mirror assembly with no modification required.

Does the heating element work right away, or does it need power routed?

The heating element is integrated into the glass. If your vehicle has factory heated mirrors, the wiring harness is already in place and will power the element immediately upon installation.

What if I order the wrong side by mistake?

Return window starts when you receive it — verify right vs. left fitment before installation. Once the glass is mounted, standard return terms apply; contact support with your order number for specifics.