Our extender screw is the same on all our models, so you don't have to worry which one to order based on model.  It is a M8 high tensile cap screw specifically designed to connect an extender to the main seat frame.

You can also use any M8 high tensile screw from your local hardware store; as long as it is M8 high tensile around 23-23mm long, it will work even if it's not exactly the same style screw head!

This extender screw will fit ALL models.

Let us know if you have any questions!