I just got a new Cannondale Trail a few weeks ago (March 2018) and it came with RockShox XC30 100mm travel 29" wheel front fork. I'm heavier than the average rider so I need the XFirm spring for it. A quick internet search found lots of sellers selling the 11.4018.010.030 part. I purchased this and It's too short by about 2cm making my suspension travel substantially lower. RockShox's parts guide reveals that it is for the 2012-2015 (A1-A3) XC30 shock. The same parts guide lists a 2016 XC30 B1 shock and a different part number for the spring that I can't find listed at any store (11.4018.010.165) (edit: online, in the US).
I don't want to make the same mistake twice so before I ask my LBS to order this part. Am I getting it right? Is this the right part or is there a 2018 model year XC30 shock with yet a different set of parts?