IN-Direct Measure:
LCD Backlight (CCFL Lamps) are hold on inside of Reflector as picture
shown at below. There are Silicone Rubber Cap on both ends of CCFL Lamps.
The measurement should be from glass to glass( Shown on Photo below)
plus the length of one of Silicon Rubber Cap.

For Example: The measurement from glass to glass is 290mm, your Rubber Cap
measurement is 5mm (Only Measure one of cap), Then you correct length
should be should plus 4-5mm each end. Let use 5mm for example.
So, the correct length should be
294mm+5mm = 299mm.(11.3") Selected the length slightly shorter then
your measurement base on our part number: LTD141ECGF