You can probably get it a little cheaper online. But then you have to wait for it to show up.
Have you tried local wreckers? The adjuster is common to almost all H4 engines from '97 up to '08.
Bound to be able to find a second hand one somewhere, if not, they're not expensive new , and should be either in stock or available locally from a dealer parts dept.
Plus, you'll be supporting local business

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F.B. Racing
01 WRX (STI badged)
2010 XR5 Focus
06 Impreza Hatch 2.0i