Dyna Glide ModelsSuper Glide, Super Glide Sport, Super Glide Custom, Dyna Glide Convertible, Super Glide T-Sport, Dyna Glide Police, Dyna Switchback, Low Rider, Street Bob, Fat Bob and Wide Glide.
If a low mounted oil cooler is in your future, then go with the Sputhe, otherwise, either one will do. The Sputhe does have a nice added feature on the rear stabilizer that firms it up maybe better, but hard to tell if it really adds to the overall improvement.
I think they both do the exact same thing, but True Track is not only a site sponsor, they are the Dyna forum sponsor as well, so that would be my recommendation.
Either one will work and you will be amazed by how much. I installed the Sputhe Positrak a couple of months ago and posted some pics and tips on the installation process. The True Track has a T-shaped front stabilizer which is made of aluminum and is thicker than the steel unit from Sputhe. Also, the Sputhe unit has a couple of locking bolts on the rear unit to secure the stabilizer to the frame.
Here's the link to the discussion. There's a link below that for the Sputhe's discussion on Dyna instability and the fix. Good Luck!