RMS rails length for 4ft

[stan255]

Hi, can anyone post a picture of their 4ft tank with RMS rails? I'm considering between 40.5" or 50.5". I read that there will be an overhang for 50.5" but by how much?

 

[shakacuz]

if i understood correctly: 4ft tank is roughly 48in. the 50.5" rail will have the difference as overhang, so roughly 2.5" or 1.25" on each side.