I have a 2004 V11 Sport Ballabio. It had the correct size of boss on the shifter since new. It broke the spring about every 4,000 miles. I tried stock spring, better spring that would not break, but they still did. I was about to do the coil spring mod when Chuck and Scud came up with the fix with the spring with thinner spring steel and two wraps in the coil. I installed about a year and 4000 miles ago and has worked perfectly since. It is the best solution. contact Chuck / Scud about if they are making more or have available