First, my magnet has verified the bars are made of steel.
Now, on to your question. What exactly are you talking about? If you're referring to that silver aluminum piece you got, that's an adapter for aftermarket clip-on style bars. Since you have stock risers and bars, it won't work with anything you have.
Got a picture of the handle bar you bought?
1990 EX500 - 140,000 miles as of May 27th, 2019
1993 Ducati 900SS - The real canyon carver
2002 EX500 - Undergoing a full restoration