General Electric F40T12 Preheat Ballast

I got two, NOS. Coded "WB" or September 1987. They both work, naturally. I was delighted to find that they have full-lengh blue leads, though the white and black leads could've been a little longer, as the white has to make it to the socket, though as long as the ballast is mounted close to one socket, the blue lead easily reached the other. both have their original boxes too! One will go in the light from my grandpa's shop (after it is replaced) and the other will remain NOS.