I would just get a new rack.
I had bought an OSP kit a few years ago - two vertical posts with horizontal bars with end-caps for feet. It was nice, but I thought a 4-poster rack would be more stable. I spotted a Nitro rack on eBay and bought it (only paid $25 w/shipping). When I received it, I was shocked at how short it was.
If I had known, I never would have bought it.
Now I have a Crimson Mesh kit and really like the taller rack it has.
I guess the Nitro is for kids or small people.