This is a working 800 number for Wess Plastics.
I am still loking for a web site.
For years thry have been a supplier of quality slide mounts for the Audio
Visual Presentation business.
As of 7:30 PM tonite 5/31/01 I can only reach their phone message.
In years past I could get their catalog and order direct.
The search continues.
Wess Plastics (Wess mounts) offers full frame mounts that are specifically
made for your situation. Contact them @ 1-800-its-wess (u.s. only) or
1-516-231-6300. I'm not sure as to whether they have a web site.