I am exited that I found excellent tie downs that are perfect for the back of the model Y. They have the same thread as the bolts that attach to the bottom of the vehicle so they are very secure at the back. Purchased on Amazon "Lixada 2 Pack Kayak Track Mount Tie Down" stainless steel, has part number Y14120 on the package. Photos attached. It was easy to remove the bolts and put these ones in. At the front of the vehicle I the bolts were too far back so I attached two more tie downs a the top of the front vents in the plastic which is not as solid as into metal, but should be ok for our light kayaks.