I have an older Troy Lite bar that is 5 pounds. It is about 54" and holds 80 pounds. I bought it as a set (40 lbs) at www.fitness1st.com years ago and purchased a few extra plates along with it. Now they sell the plates that you can grip but mine are just the solid "quiet iron" plates. Amazon also sold it in a set. Hope this helps!
Edited to add: fitness1st still has them, and yes...works well with the FitTower. The Troy is what Cathe used in older videos, like when you see just 2 plates on a bar she had two 7.5# plates for a total of 20 lbs.