The wheelskin comes with a needle and thread. You place the wheelskin over the steering wheel, then you start with the needle and thread and stitch it up. When you come to the steering wheel spoke, you make "dummy" stitches that allow it to fit over the spokes.

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'81 MB 300SD, '82 MB 300D Turbo (sold/RIP), '04 Lincoln Town Car Ultimate

Sooner or later every car falls apart, ours does it later!
-German Narrator in a MB Promotion Film about the then brand new W123.