I bought a used Acerbis tank for my 03 WR 450. The pecock on the right side leaks, so I need to replace it. The question I have is the petcock on the left side is different than the one on the right. The left is a normal petcock, the one on the right has a metal knob. Is this the normal Acerbis petcock or did the previous owner install a different one? The reason I ask is that I don't see that style petcock for sale by Acerbis as a replacement. Here is a pic. Thanks.