Nick,
Ignoring the ARB and steering arm, there are three principal components locating the front wheel carrier: the strut, the transverse control arm at 90 deg to the car axis and the diagonal control arm which runs from the front of the subframe to the transverse control arm, angled at about 45 deg to the car axis.
Have a look at the Main group 4: Front axle, steering for your Cayman in this link:
https://www.porsche.com/uk/accessoriesandservice/classic/genuineparts/originalpartscatalogue/
Jeff
Ignoring the ARB and steering arm, there are three principal components locating the front wheel carrier: the strut, the transverse control arm at 90 deg to the car axis and the diagonal control arm which runs from the front of the subframe to the transverse control arm, angled at about 45 deg to the car axis.
Have a look at the Main group 4: Front axle, steering for your Cayman in this link:
https://www.porsche.com/uk/accessoriesandservice/classic/genuineparts/originalpartscatalogue/
Jeff