Opel Senator B + Airbag(s)?!

Hello, I would like to add a Opel Senator B 3.0 24V of the last year of construction with a maximum of 150,000 km with absolute full equipment. Color should be at best wine red/red brown or gold (for this I can also re-paint this, because probably any varnish or rust spots must be repaired!). Otherwise the car should be in a very good condition, ie no perforated leather or worn off buttons! Anyway, everything should be original. Just such a car is very hard to find, someone has tips where I can still look for, or even sell one myself. Shouldn’t be too expensive, since the car is for my son. (Is now his dream car!) Now to the next problem: Unfortunately, there were never airbags for this Opel model :/ Is there currently any way to equip the car with airbags? Of course, the best would be 6 airbags (driver/passenger head and side airbag, as well as in the rear side airbags)! mfg