Actually Walker is part of Wiremold not Hubbell. Here is a link to there site: http://www.wiremold.com/product_catalog/walker/index.html
Hubbell owns the Raco line http://www.hubbell-raco.com
You might also try Steel City which is part of T&B http://elec-cat.tnb.com/tnbcat/tnbcat/webcat
Its hard to keep track of who owns who these days.

Curt

Curt Swartz