mine are from xenondepot (thanks Steve!)
picture of the filing i did to get the bulb to sit correctly
a lot of people tend to put the bulb with the return wire in the left there
when looking from the back of the projector the return wire (thats at the top of the bulb) should be facing down...just file either a groove at the bottom or make the top part of the opening bigger. I also sanded off the nubs to make it flush
Before fixing and filing
After fixing and filing
not all need to have this done but this is how i got rid of the dead spots