Above is the VW steering coupler I purchased to isolate the ground for the horn. It did not fit the u-joint I am using because there are 48 splines on the steering coupler and 36 splines on my u-joint. Both are 5/8" in diameter. I went looking for some way to go from 48 splines to 36 splines, but did not find anything. I can't find anything else that is 5/8" in diameter with 48 splines. In my search, I ran across a thread on "The Samba" where someone was saying that the splines are not supposed to be an exact fit, but rather the splines are there for friction. Is this true? I assumed that if you had 36 splines on the male end, you have to use 36 splines on the female end.