Depending on the damage, mortar will stick well to styrofoam, also depending on your location, you could buy a replacement from Gingerbread Trim. They custom cut styrofoam products, check them out at gingerbreadtrim.com

Also take a look at http://primestucco.com for one of the largest suppliers of pre-coated stucco mouldings

I was looking for some of these sites for where I could gain the right info. Thanks for the share.

Cheers.

Thanks for being you....

Hello Super Dave.
How did your repair turn out?
I have been writing a stucco guide to help with stucco and plastering questions:
www.mortarsprayer.com/stucco
I am happy to help. If I get stumped on a question, Herb Nordmeyer the stucco scientist helps out with deeper answers.

Best regards,
Nolan scheid