Roush Saleen Series IV issue - Can you Help?

My Saleen Series IV Supercharger has a broken part. I think I need a replacement. The valve on the driver's side of the supercharger has a stem that basically broke off. It whistles and causes surging with the car. I've got it taped up but I need to fix it. The problem is that I really don't know how to fix plastic like this. I'd buy a new one but the prices that saleen quoted me were a bit outrageous. I wonder if this is something that I could get from whipple. Let me know if you can help.
Thanks,
Brian

It's called a boost actuator and I've found it priced from $48-$59 at different places. It's not nearly as expensive as I thought it was going to be.