The FXDX shocks have the lower mount offset inboard, so the mounting bolts clear the muffler.
I'd like to find a pair of these (new or with low miles) for my FXDCI, to raise my bike a little. It's too easy to drag a footpeg. Yes, my stock shocks are adjusted to raise the bike as high as possible.

Or, does someone make a replacement shock (Progressive Suspension does not) the has the same length (13", correct spring rate) and the offset lower mount?

 

Sorry for the confusion, you need shocks that are 13" between the mount holes, why the offset, don,t they just bolt to the existing mounts?

 

the fxdx has 13.5" shocks.
can be found on ebay sometimes - usually go for about $300 in low mile condition.
works performance makes some 13" that can adapt - prolly not as good as the fxdx shocks and cost around 450.