[SETI20]

The headlight swap should go like "Take out USDM headlight, put in JDM/EDM headlight, re-wire, done."
If it's sagging, something is wrong with either the mounting points, or the headlight frame.

 

[SETI20]

Well.... keep in mind that the JDM/EDM headlights used on the SiR/VT are shaped differently.

So even if you have JDM corners, if they aren't SiR ones they would not liine up perfectly still.

In this case, the curvature of the corner would be different, leaving a small gap between the headlight and the corner. It should fit the same apart from that.