Modernica Fiberglass versus DWR plastic  

The only reason to reshockmou...
The only reason to reshockmount is if the shockmonts are shot. If they are in good condition then the modernica bases will fit. Simply find 4 shells in good condition.

If you order Modernica...
If you order Modernica shells please consider ordering from www.articledesign.com . The number is 601.321.1958 . The owner is extremely helpful and knowledgeable with Eames stuff in particular. He can get them shipped directly to you as well.
I do not work there, so don't worry. I have just had extremely good experiences with this store. I have bought several new items there and he has gotten my shells reshockmounted as well.