In the name of saving a few hundred dollars I bought my PFO mini pendants from a "not to be named yet" company with only E-mail customer service. I bought two pheonix 14k bulbs to go with them. The bulbs only fit in one fixture due to the ends. My bulbs have ceramic ends shaped like a "T". One of the fixtures has spring loaded ends for a different type of bulb. Are these (the spring load) an older style of DE bulb or is this something I will need to specify in the future when ordering bulbs?