I'm debating whether to take my front window trim to a shop and get it reconditioned or purchase new. USDM ones (LEFT AND RIGHT) are discontinued but you can get JDM ones. But question, why do JDM ones require trimming?

The lower moulding is different on them. They don't clear it and are shaped slightly different below the hood area. You need to continue the clearance notch up the moulding about an inch for them to fit with the USDM glass/lower moulding.

Jeff