Opel Vectra A 2.0 I Motor 20 Ne from 1991, Gas A/A

Good afternoon everyone, first of all thanks for reading my post to see if I find professional help:
my vectra came from the factory with a gas in the air conditioning circuit I think it was the R12 that is no longer manufactured or exists, it would cost a lot to attach the necessary devices to put the new gas, they have asked me € 200 in Valencia and as it seems somewhat exaggerated.
Greetings.

I am not very sure with respect to Freon 12 that is the one brought by vehicles, but I think it is not necessary to make any change only the gas, almost certainly. I do not believe that the gas they brought inside the circuit influence, because here in Chile the Freon 12 was prohibited and filled them with another gas without making any change.

Good afternoon Kikemec, I deduce for your response you live in the beautiful Chile, you would be grateful, if you could inform me more specifically consulting how they do to argue here in Spain knowing the type of gas they put, here they give the alternative of R134 but requires changing all the toric joints of the circuit, the filling ropes and the compressor oil for it Pasta
Thanks for your prompt response and greetings

As soon as I find out, I will make the consultations to some colleagues who are dedicated to the subject, so I leave and you from doubt.