[Perfectlap]

I don't think using the red clip is a good idea anyway.
You shouldn't leave your Boxster unattended long enough or be far away enough from it with the top down to necesitate such a device to secure your car.
And it takes a toll on your interior trim and leather to leave it exposed for long periods. You should see some of the sun damage to some old car covers I used in the past and the kicker is that I rarely used them. Raise the top if you are going to park it in the sun.