There's a guy (usually in the Blue Hall) who sells complete kits and separate parts for all the original Plasticville products. I bought a dozen signal bridges from him, less the signal heads, unfortunately. Otherwise, I'd be happy to send them to you. I will go out to the barn and look in the boxes under the train table when the snow lightens up a bit in case I have some from other kits. If I got'em, you can have'm.
Are you aware of the Plasticville Club?
http://www.plasticvilleusa.org.../articles-parts.html