On the ordering page http://www.superbrightleds.com/other_bulbs.htm#pcb
It is in a section labeled "T10 PCB series LED Lamps", and the product is labeled "T10-PCB-Wxx White LED Lamp". The description says "Miniature wedge base (194/168 type) 24 or 36 Super White LEDs - Wide 100 degree beam pattern 12 VDC Operation" The "xx" in the name is for the 24 or 36 LED version. One has 24 LEDs, the other has 36 LEDs. I got the 24-LED version. It makes plenty of light, illuminates the whole trunk, and only draws about 1 watt of power.

The key is that the male end of the plug fits into the same lamp holder that the little light bulb comes out of, and there is enough wire to run over to the mounting location an inch or so away. The "194/168" size lamp holder will accept a 194 or 168 lamp. The T10 type is the same size, but there are other lamps (fluorescents) that are also called T10, so that name can be confusing.