Will these bolt straight into my stock headlight location?

Yes, these are designed as direct replacements for your factory headlight buckets. No cutting or bracket modification required — they use your existing mounting points.

Do the sequential LEDs need custom wiring or a control module?

The sequential function is built into the housings, but confirm with your installer whether any relay or module work is needed for your year model's electrical system. Some T660 trucks may require minor harness adaptation.

What's the return window if these don't fit or work as expected?

Contact our support team with photos of your setup and the issue — we handle returns on a case-by-case basis. Keep all packaging and components in sellable condition.