They disassemble them, cut to the height requested, install new seals and reassemble. Their Web site gives a pretty good explanation of the whole process, they do real nice work and I have no issues with the shocks, just that I am not happy with the overall ride quality of my 09, replaced with a Arnott system and have these laying around now.
These will fit any of the 09 Touring Chasis. Conversion alone from Bitchin Baggers is $175.00. Anyone looking to get lower for better reach / footing on a bagger will like these alot better than lowering brackets.
I got the 12", they are ok but can't say the ride is worth the money, I got the ones with the dampening valves, ride is better, but still not the best.