can you indentify this rack slide?

[Brad Parker]

Hi -

can anyone identify the type of rack slide in these pictures?

    http://www.heeltoe.com/images/IM001376.JPG
    http://www.heeltoe.com/images/IM001377.JPG
    http://www.heeltoe.com/images/IM001378.JPG

I have 4 different pieces of equipment which where pulled out of racks
and the "mates" to the slides where left behind.  They're all the same
"u shapes with wings" slide.

I'd like to find the same type so I don't have to remount the slides
(color me lazy).

I think these are common on DEC equipment, but I don't know what they are...

thanks for any hints!

-brad