How to connect plastic shower drain to 2" copper drain line?

I am having trouble locating something that will allow me to connect my new plastic shower base drain to my 2" copper drain line. I am replacing an old shower and can not find any flexible couplers for this situation. Please help me before I go crazy!!!

Any help would be appreciated!

Proflex by Fernco, part #3001-22 , for 2" CI, PL. or ST. to 2" Copper. The equivalent Mission part is CK-22.

Check it out here:

http://www.fernco.com/proflex.asp

Thanks for the advice

Thank you and I HOPE this works as I've looked at many items and nothing seems right. Every plumbing store I go to says they don't have what I need so hopefully this will do it!!!!

Thanks again.