PLEASE NOTE THE KNOBS SHOWN IN THE IMAGES ARE FOR ILLUSTRATION PURPOSES ONLY. THIS LISTING IS FOR A SINGLE (1x) SHAFT ONLY.
Should you need the knobs themselves Porsche will supply these in pairs, The part number is 99664191100.
Porsche produce the spare knobs themselves but sadly it's the shaft that the knobs sit on that snap. Porsche do not make this part which means the only option you have is an entire new set of instruments.
These reproductions are based on the original Porsche item but manufactured in a much more flexible material rather than the brittle plastic of the originals which will prevent any further breakages. It's recommended to replace both at the same time whilst you have the cluster open!
There is a you tube video showing the DIY installation process here: https://www.youtube.com/watch?v=E-Fw05jsPWo&feature=youtu.be
Please note these are sent Royal Mail standard post, There is no tracking and it can take a while. Up to a few weeks. If you are in a rush I can offer a tracked service with UPS or DHL which you can select on check out.