The Sylvnania Xenarc kits were discontinued for a very good reason: They're trash, poorly made in Taiwan by a (nominal) contractor with a basement workshop (no exaggeration) who would've been hard-pressed to produce a quality glovebox light and was way over his head to develop an optical instrument as complex as a headlamp. This was supposed to be a product that would jumpstart North America's relatively low interest in HID headlamps. It backfired spectacularly for Sylvania, because of the very poor performance and even worse durability. Lenses yellowed/clouded within weeks or months and fell off shortly after that, bulb shields fell off and rattled around inside the lamp, water got in. And because there was no qualified optical engineering in their design, they tended to do bad things like fail photometric compliance tests. Then there were the other issues (such as X5006 5-3/4" round units that arrived from Taiwan with the locating lugs in the wrong place on the plastic frame. Rather than reject them, the con artist supplier Sylvania had for some reason got in bed with ground the lugs off with a belt sander and used super glue to affix little plastic nubs on in more or less the right place. A quality product, you betchya! They were remaindered off. The intent was that the buyer would salvage the ballasts and bulbs and discard the lens-reflector units, but instead, the current vendor has filled up his website with a bunch of made-up nonsense about how they're a "second generation" product (false...there was one and only one production run), together with blather about how you can remove the bulb shield to get super-duper extra-great lighting (wrong...all you do is produce dangerous levels of glare and backscatter).
There are options for good lights in a vehicle with large rectangular headlamps. Various vendors sell the "pudgy" BiXenon projector units made by Giant Light of Taiwan (a good deal less awful than the Xenarc junk). The only sealed beams worth buying are the GE Night Hawk H6054NH units. Or you could put in any of several well-made H4 setups.
