Thanks for all this helpful information
I have for the past 60 000 miles driven my 79 W123 non-turbo with a home-made job in which I fitted heavier flex hoses and double clamped them with the sturdiest clamps I could buy. This way I did not have to undo anything. But I now have a pair of lines from a turbo SD that are in good shape, and I want to redo the job.

Does anyone know if the turbo lines, though a bit fatter, can be fitted easily onto a non-turbo? Both vehicles have the GM style ac compressor.