American Fluorescent MS-104 or similar.

 Light bulb depot

Light bulb depot

What is the item number?

 If u have bit of common sense U type in MS104 in Light bulb depot search bar.  It comes up right under your nose

Thanks! 

To be fair, it's not that apparent. The fixture has been discontinued for years and the model numbers have been scrubbed from the manufacturer's site.

American Fluorescent MS104

Yes these fixture is very limited in stocks.   I have bought them locally years ago.   Anyway when I gave him where to look.  There
Couple of collectors bought them couple months ago.  When I give
Some one where u can find it.  As at time I typed this is where to find one and when he ask for a item number.  This how some one find stuff specifically what there looking for.  By typing in the model number and see what surface.  If spent many years searching for
Stuff on Light bulb depot web site and then I try go locally in San Antonio as it a guessing game to know what they have availble cause
All u see is a counter and they wont let me look around to see what lamps they have.

American Fluorescent MS104

I have this, or something similar, found discarded.

After a year in a bin of to-do projects, I repaired it somewhat, added a ground wire and use it occasionally when I just need a "night-light" in my basement. I never took a pic of it 'til now. The sockets need to be replaced (broken feet) but this is a neat little light.

Shipping probably wouldn't be cheap.