Does this mount the same way as the original light?

Yes. This assembly uses factory mounting points—bolt it straight onto the existing hardware with no modifications or new fastening required.

Will I need to splice into the truck's wiring harness?

The connector type isn't specified in the product data. Test-fit the plug before purchase to confirm compatibility with your Trailblazer's factory harness, or reach out to confirm the exact connector style.

How long do the LEDs last compared to the factory light?

LED elements are rated for tens of thousands of hours versus standard incandescent bulbs. You'll see significantly longer service life and less heat output in daily use.