That is a really old LED, not sure it will be easy to find these days. Kaidomain looks like it has some stock of the XML.
Other places to get LEDs:
Yea...I made a 6 foot aluminum light bar, and last year, I fried one of the emitters by shorting it out. I might be better off cutting the aluminum heatsink down and run the light with 5 emitters. Thanks for the sources, it's been a good 5 or 10 years since I visited this forum, hope to get back at it once I get my cnc mill next spring.
On the bright side you can flow newer emitters as both the XML2 and the SST40 offer the same solder footprint. Could be a good way to upgrade.