There's been a number of folks with older vehicles who've installed the Truck-Lite redesigned LED replacements for sealed housings. I've seen a few in person and am impressed. BUT...I've seen a few who have axed them in favor of a HID retrofitted projector setup for it's range, width, and upgradability...not to mention affordability.
And judging by that last picture in the link, it'll be the same problems the plug-in HID's have.....the glare to oncoming traffic. For the optics to work right, just as with HID, the bowl/reflector needs to be LED specific.
I feel the technology and options just isn't there yet for a do-it-yourselfer universal installation. I can see in a couple more years, it'll be more available to folks like us. It's just too new and the options aren't there yet.