Measurements are approximate and may vary +/- 5% due to the design (bezel size) of the TV in question:

TV Size (inches) Inches to backlight # of kits # of extensions 32 82 1 0 40 104 1 0 50 132 1 2 55 146 1 2 60 160 1 3 65 172 1 4 70 188 2 0 75 202 2 1