"Exact" would be tricky, as the 10V bulbs don't seem to be manufactured any more. However, the CM7371/CEC7371 should work fine and is available from Farnell/Newark and from Mouser. (Oddly, it looks like Farnell ships them from the USA but they cost less if ordered from Farnell, rather than Newark.) If you have old panels around, the originals are the ones with the blue base. They were used in the 8/E bulb panels, as well as other DEC gear. They may be marked OL-2 on the base. The CM2309 was an exact equivalent for the OL-2, and I've seen those in old panels too. (I've also seen others, often wildly the wrong bulb for the job.) Vince