I was told that the air shocks off a street glide are an inch shorter than the ones on an Ultra Limited. I believe mine is 13" and a street glide is 12". Can I use these to lower my Ultra?
Long long answer. You can, but you'll be an inch lower. I have a Road King Custom which runs 12" shocks too. Stock air shocks. Not overly comfy but I've never bottomed or topped out. Adjust then properly and yes, you can use them successfully.
Sent you a PM, but it sez your inbox is full.
If you are interested, I have a pair of 12" hand-adjustable shocks for sale that were take-offs from a new '18 Street Glide. $300 shipped.
Well.... Technically, the "stock" length shocks are 12 3/4 inches with 3 inches total travel, and the "lowered" shocks are 12 inches with 2 1/4 inches total travel. But thats splitting hairs. As mentioned above, if you want to lower the bike, you'll be far happier with the 12 inch HAND ADJUSTABLE shocks, than the same length air shocks.