[First opel 1981]

There is a small amount of luggage space next to the spare tire but with a spare tire, its very little space.

It is possible to fit 5 teenagers in an Opel GT. I wouldn't say it was comfortable, nor safe, nor legal, but it was done one night.

My honest opinion is that an Opel GT is not a good car for a car seat. There just simply isn't enough ways to be comfortable and keeping the baby safe at the same time unless its just one adult and the baby seat in the passenger seat.