[Bench-Racing]

Rigged up such an attachment on our 356 and 911. Removed seat belt attachments and installed the eye bolts. Took a med size tie down (the kind used for fastening loads to your luggage rack or truck bed, the ones that come four to a pack from Costco). I was then able to more then securely fasten the seat to the car and then use the built in four/five point harness built into the car seat. No permanent modification or damage to the car and a very secure child. Our 9 year old still remembers doing laps at California Speedway in the back of the 356 when he was two and a half. Priceless.