I ordered the same months ago, and that is all I got, when I phoned Caterham they said ,oh no the spike part is a special order. I ordered those at the time of calling and typical Caterham not heard anything for months. When I chased the order nobody knew anything about them!! i would suggest you try Oxted trimmers even if it means sending the arm rest for them to fit the spike, that is what I intend to do when I get round to it. Kingsley.