Questions about the airbag system

Hello.

I'm upgrading our big airbag. Since we will install a new 3-spoke wooden steering wheel, the airbag should not be just decorative. I've got all the pieces together.

I have the wire harness, the energy reserve (part no. 443959659), and the control unit (part No. ==References==
As far as I have now decrypted this, I still lack the voltage converter and possibly the indicator light in the AI.

Now to my questions. What part number does the voltage converter have? My harness is from 1990 and has two connectors that do not appear in my circuit diagrams (MJ92 and 93). One plug is white, two-pin and has a green-brown cable, the other is black, also two-pin and has a brown and black cable (probably Kl. 15 and 31). All three lines go directly to the control unit. Can someone help me? Are they the revised diagnostic plugs?