The LH0990 Hill Phoenix P065448EWH is and unshunted, molded socket for Hill Phoenix cases that fits the LH0877 cap.
The Hillphoenix P065448EWH is a white bulb holder that is 1.5 inches tall, 3.2 inches wide, and 4.05 inches long. It's a snap-in lamp holder with the LH-08R-2 model number.