So on the Rear Shocks (2015 30DS (sitting on a 2014 F53 chassis) in this case), here is some data:
3/4" ID x 1 3/4" wide for the attachment point (I don't know if this is standard shock knowledge, but I figured I'd take the measurement while I'm at it.)
Also, anyone who has installed the Koni FSD on the rear, did yours come with a dust cover on the upper shock? Mine didn't, though the front that I've already installed did. So I'm not sure if I'm missing something or need to order some aftermarket covers prior to installing the shocks. Idk.