I have just bought something like this so happy to hear it works well it hasnt arrived yet but cant waitThis is what I bought for STS and it is working well.
Also I had to buy a second bar and additional weights when I started Mesocycle 3 a few weeks ago. The weight was too heavy to lift on and off the bar going back and forth between bench press and back exercises (barbell rows and dead lifts). I got them at Play it Again Sports.
Hope that helps! You will love STS, it's the best series I've ever done. I'm in M3 week 3, almost done but will definitely do another cycle in 2017.