I've found the letters/numbers stamped into the driver side turrett, I can feel the raised lettering under the paint so if there's any problems I'll grind the paint off. There's nothing in the raintray.

On all my other Golfs I'm pretty certain there was a VIN plate that was riveted to the slam panel, this MK1 has nothing.

Ordering parts? I think I once ordered parts back in the 80's.