Not cheap and designed to fit nicely on a Cape Dory toerail, these Spartan Marine beauties might solve a lot of problems such as the spring line rubbing against a stantion or worse a foot injury from an awkward-placed cleat on the sidedeck. I do not know how they might fit on the glass toerail on the Ariel, but my friend has them on his CD-27 and they are SWEET! The last thing I want is a speed bump to the foredeck.