The DIY solution is to find the original lamp from the least expensive supplier, usually without the cage. There are several places to find cross reference info and more vendors are supplying the lamps all the time. Some can be found, some cannot without going to the maker of the display.
Try some of the vendors here:
http://www.hometheatershack.com/foru...tributors.html
another to check
http://www.intl-lighttech.com/tvlamps
Just be sure that you are getting the same lamp, not a sub or replacement made by a different vendor, unless you can confirm compatability with no doubt.