The after market doesn't realy have one for use The fisher Dampener I ran didn't need any Mod made to. And fluid, ATI(like I'm going to useing now) or any other Vthing dampener will need to be machined a 1/4in Or you must machine the crank gear that much so the dampener sitts all the way back where it should be. Plus some changes to the water pump pulley may be needed as well. And You will also have to add a pulley to the dampener. Because the Vthings do not have grooves like our L6 dampeners do. BUT fisher Does Make a dampener Now for Our L6s that does have the grooves. This is NOT a race ****pener But For STREET USE ONLY. It is Not big enough in diameter for HIGH RPM harmonics. Hope this helps. }[oooooo]
Ps The added benifit of machining the Crank gear is you will now have TWO keys Holding the dampener not just the one.