I received my LinerX 3 row Gravity mats today. Happy to say that the 3rd floor liners do fit, barely. I found that the holes did not line up perfectly. THe hole to hole (left to right side) distance on the mat were about <1cm shorter than the Gravity pegs. I could see the peg through the hole once I got the mat lined up properly. So I used a steady, firm pull on the mat and was able to get it seated and it clicked in. I don't think I pulled excessively, both pegs held nicely. All seems secure. If it had been any further off, it would not have stretched enough. I couldn't wait (typical of me), but perhaps softening them somehow would have made it easier.