If you bothered to read my last post, you know that I was looking for some brighter than stock headlights for my 1990 K5 with the 4 light system. Unfortunately, there is NO selection whatsoever for these smallish 4703/4701 sealed beams. After much looking on the internet, I finally found a kit from that fits into the old sealed beam openings, but actually has a hole cut into the back of the housing allowing the use of modern H7 capsule-style bulbs. There is an o-ring included to keep out moisture and also a locking system to hold the H7 buld in place. You can get the conversion housing for low and/or high beams. The glass lenses are a little different between the two, obviously. Anyway, I can now use any of literally several dozen H7 bulbs on the market. You can go with wagner brite lites, the fake "xenon" bulbs, PIAA's, etc... Everything looks dead stock unless you use a blue tinted bulb, which is slightly visible inside the housing from certain angles. As far as wiring goes, it is possible to cut off the stock plastic connectors and simply replace them with female blade connectors, but for higher wattage bulbs, a relay is the way to go. Unfortunately, I don't have a digital camera, but hopefully you get the idea. I may try and borrow a friends camera later this week to post some photos. I would highly recommend this modication to any 89-91 blazer/jimmy/sub owners who are tired of our lame factory setups and don't want to hang all kinds of aftermarket lights everywhere. Oh yeah, the housings are from www.autooptiks.com and the bulbs are available everywhere.