I have a set of ZB Forged muscle back irons. I lost my 5 iron. How can I get another 5 iron? email@example.com
Try out this website, I have used iron finder before and know that they are a legitimate website. Hope this will work for you!
Ebay is always a good option
There are several large volume internet retailers of found clubs. Ironfinders.com is one of them.
You might want to buy a set of club shaft labels. I bought mine from Greenbriar golf and they saved my butt a couple of times.