Nice set !
The dial lamp is mentioned in the service manuals as type "Master 39K".
Lamps for the Master Deluxe 39K is mentioned as "Master Deluxe 39K".
They are very similar but, I believe, different - or they would probably bear the same markings.
The service manuals will provide more info - I will give it some more time tonight.
While restoring a Beolit 39 recently, I located a new "Master Deluxe 39K" lamp but it didn't
fit in the Beolit which uses a third type - which wouldn't fit in your set either.
Differencies in the valve heater chain(s) are the main reason for this, a dial lamp is not just a dial lamp.
I ended up building a homemade solution, consisting of three resistors to dissipate heat and drop voltage
and 2x 110V halogen bulbs. Maybe you saw the thread here at Beoworld already.
Martin