...

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Note added at 11 hrs (2008-01-08 10:55:53 GMT)
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"cabeza" in Spanish = head

and there are loads of ref for "door header" and one or two look like the picture, though the ones I have found are wooden.

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Note added at 11 hrs (2008-01-08 10:57:07 GMT)
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OR

header track

Door track for an elevator door system - Patent 7152713
Each header track is a formed metal section having a door track or a rail for providing a running surface for a corresponding door roller. ...
www.freepatentsonline.com/7152713.html - 36k - Cached - Similar pages
[ More results from www.freepatentsonline.com ]
Bungalow Details: Interior - Google Books Result
by Jane Powell - 2006 - Architecture - 224 pages
For a single-roller door, if you can get it all the way out (most have a retractable wood or metal finger on the back edge of the door that catches on the ...
books.google.com/books?isbn=1586853058...
Pest Help UK - Door & Window Fly Screens & Insect Screens
CHAIN DOOR FLY SCREEN CURTAIN - an aluminium header rail with aluminium .... This Horizontal Roller Door Fly Screen is easy to fit to the reveal of doors. ...
www.pesthelp.co.uk/weshop/Door___Window_Flyscreen.asp - 71k - Cached - Similar pages
Patio door roller repair
If it still rubs and does not slide well, the header has sagged too much and will need ... Modern patio doors often have die cast metal roller assemblies. ...
www.all-about-screen-doors.com/patio_door_roller.html - 26k - Cached - Similar pages
Welcome to Door-Aid
Requires a metal header of 3 1/2" in width. Door-Aid® installs "shaft-up" ... an elevated surface (level with the valve body) for the arm roller to push on. ...
www.door-aid.com/products.htm - 15k - Cached - Similar pages