Hello! So I'm looking to upgrade the rear shocks on my 2012 FLSTC Heritage. I've pretty much settled on Progressive, but I'm having difficulty sorting out which model to use. I don't want to lower the bike, the stock height is good for me. I've found two models 422-4037C and 422 - 4002C. Has anyone else used either of these, or something else to replace the stock shocks? Any info is greatly appreciated. Thanks.