After spending about an hour looking at one vendors site after another I and running checks on lighting forums on several boards I can't find a mention of csl ever making a super actinic or 10k only 40w bulb.
There's only 3 choices as far as I've been able to find for 40w bulb.
dual actinic
dual daylight
50/50
I did find a few 10k only bulbs that might work, but they were all in either 32w, or 36w. So you'd lose some intensity. I'd either pick from the bulbs listed above, or sell the fixture and try to find a retro kit that will fit your hood with the bulbs you want.
Good luck,
Brian