Not sure what you mean by "loaded"?? Also, are you sure they are not 12 1/4" x 3 3/8"? That is the standard size, 12 1/4" x 4" is the HD size.
Sorry, can't help on the web site...
"NICK"
I want complete backing plates with pads and magnets etc. Alco's site states they are 3 1/2" wide.