Durst 138S bulb (for 5x7" + 6x17)

I have found an 138S in very good condition and at a very reasonable price.
Could somebody please tell me if bulbs are available for the above mentioned?
I intend to use the 240+240 combination with the Componon S 210/5,6 lens
for 5x7 and 6x17.
Thank you

Condenser head I presume?
glennview.com/durst.htm (Chicago, USA) has a bulb option available