As mentioned in my original post, I have the 13" O E air shocks that came off a brand new FLHTCU. That owner wanted the 12" shocks from my new FLHX. Not sure why. I didn't have to be asked twice.

 

I did DK's blocks. They are made by Tamarack. Dropped 1". I also originally bought 1-3" lowering block off eBay but it came too close to rubbing on saddlebag with my Arnott air ride. Let us know how yours works out.