Will this bolt straight to my vehicle without modification?

Yes. These mount at factory rocker points — no drilling or bracket fabrication needed. Line up the assembly and secure with OEM fastener points.

Do I need to buy a right-side headlight too?

This is the left unit only. Order the matching right-side assembly separately for a complete pair, or use this as a replacement for a single damaged headlight.

Is there a return window if it doesn't fit or I change my mind?

Returns follow standard Modsupply.com policy — check your order confirmation or contact support for the current window and conditions.