I believe that the flow of fluid through a narrow orifice is what controls the rebound of the springs in the forks on my ultra. I also believe this system is commonly called a shock absorber. Maybe the term forks should have been used. I believe you knew what I was talking about. Or perhaps I'm giving you too much credit.
Technically it's closer to a McPherson strut, but it's all the same function. I have only heard them called forks to this point.
When you walk into a parts store and ask for front shocks on your ultra, they may think you have no clue what your talking about. Rebuilding the front forks and replacing the emulators (The control valve head) on a Electra Glide (Standard, classic or Ultra) is not a job for a beginner.
My first response was more to see what level you are at and if you should be advised to have a shop do this upgrade for you or if you should try this at home.
There are special tools needed, and if you are not careful, you could get hurt or break something in the proses. If it is not set-up correctly, you will end up with a ill-handling bike that can be worse then it was when you started.
To do this, you will need to remove the fairing, the front tire, the fender and the brake calipers to do a full one rebuild. Yes, some don't but to do it right you should.
Then there are the alignment issues when you re-assemble and you should clean and repack your steering head while you have it tore down.
Talk to a couple Indy shop and get a couple quote before you tear into it.
In the long run, it could be the cheapest way to go.