From the dealer. See techquipment on the Porsche website. Tight ish fit. i am 5 10. There are only a couple of inches to spare and had to turn off the comfort entry function. Still it is in now ?
I bought the Taycan as a family car. 718 wouldn’t cut it. Thought I would share a picture of the Porsche new born car seat and base. The base has a nice recliner built in to compensate for the rear seat angle.