Hella Blue Police Light

[AC]

Hi, I have a set of these Blue Police Lights and was wondering if anybody would know where the acquire the bulbs for them. Here are a few pictures of what I am talking about. Thanks for any help, Albert

[EverettB]

Are these 6-volt 35 watt bulbs wrong?
https://www.thesamba.com/vw/classifieds/detail.php?id=2379621

Edit:
Ooops, they are wrong since they are dual filament and you need single.

Do you want 6v or 12v though?

I found a bunch of different 12v ones on eBay, here's one that could be correct:
https://www.ebay.com/itm/163431528108
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[Frederik]

Most common in old Hella and Bosch fog, driving and other accessory lights are Ba20s. "Ba" stands for bayonet socket, "20" is the diameter in mm (meassure it) and "s" is for single filament bulb. For one single fog/driving light 45W-50W was common to use, for two fogs/driving light 35W was recommended with 6v (even 70W extra is a lot for the old generators). At least in Europe Ba20s 6 or 12V is not that hard to find.

https://www.ebay.de/sch/i.html?_nkw=Ba20s%206v&...AYQAvD_BwE

Ba20d is as said dual filament, used in headlights for low and high beam. Motorcycles used this type of bulb longer than car makers did and they are easy to find. Also in halogen and LED versions. You could accually use them/ they fit in place of the Ba20s, but both filaments will burn at the same time (if the single contact of the light get contact with the two poles on the bulb. An old trick was to but a small washer on the poles). This mean that a 35/35W bulb accually uses 70W (not a good idea) but you could use lower wattage bulbs or LED.

[AC]

Thanks for the help Everett and Frederik. I appreciate the help. I guess I did not look right on ebay. Albert