Hello, I took the trap off my bathroom sink and it was so old that it just tore the metal when I tried to put it back on. So I went to the hardware store and got a new one (1.25" by 1.25"). The problem is that the distance shown in the picture is too short, so that when I put the new one on the bottom part is about 3/4" below where it needs to be. How do I specify this dimension when ordering a new one, as I didn't see it listed anywhere. Thanks.