Go to www.universalcycles.com and look at the pike and revalation coils. I'm using the ones that uturn out to 120mm.I like the way the pike fit but it was too hard(extra firm) so i tried to go firm but they are out of stock. I am now waiting on the revalation firm.There are 2 threads on mtbr and Rainman seems to be the most knowledgable.Let me work the bugs out before you $pend anything unless ur hellbent to try it yourself.