Title: attwood 11438-7 Universal Rack-Free Car-Top Kayak Carrier Kit with Supporting Foam Blocks

No need for a dedicated, and ugly, kayak carrier strapped to your car’s roof. This kit provides everything you need for safe, easy transportation, then it quickly removes and stores away. Attwood Corporation has been an award-winning leader in engineering, testing, and manufacturing the highest quality marine products for over 100 years. We deliver safe and reliable lighting, fuel systems, water systems, seating & pedestals, swim ladders, custom upholstery, and general marine accessories that are easy to install and meet regulatory compliance.

Includes supporting foam blocks

Two straps with adjusting buckles and clips

Includes 15-Feet of polypropylene rope

Straps are sturdy poly web with vinyl-coated clips

I have used this carrier kit for about a year to carry my kayak on a 20 minute journey each way to the lake and it has worked great. The kit contains 2 foam blocks that sit on the roof and then the kayak sits in the blocks. It also has ropes to secure to the front and back and straps that secure across the kayak and through the vehicle's interior. I have used this carrier kit on a Honda Insight and a Hyundai Sonata. The biggest challenge is finding the tie down spots on the vehicles front and rear but once you have that it's clear sailing.

Dude, I put this on a 2008 2-door Mustang. I'm sure u can put this on a prius

Yes. Both blocks have a slit on the side near the bottom that the strap goes into. The blocks measure:15 3/4"L x 3" W x 4" H.

2 blocks, V shape. All you need for 1 boat.