http://www.ebay.com/itm/GE-8G3706-14...YAAOSwSzRZSwh6
http://www.ebay.com/itm/GE-8G3706-14...MAAOSwYIxYAP1F
You will need to add a starter and starter socket. Make sure the starter is rated for 40W lamps.
Agree with dieseljeep above, maybe you want to get some strip lights to contain the ballast and wiring, and elevate the lamps away from the foam a bit.. and then put these old fashioned ballasts into the new fixtures. Wire according to the diagram on the ballast. Modern T8 lamps use the same sockets as the old school T12 fixtures, should be no trouble to find some new fixtures to modify.
Have fun!!
P.S. if I were you, I'd seek out one of these for that room
https://i.pinimg.com/736x/c0/ce/61/c...3114785dd0.jpg
I think it would look fantastic with that old fitting, and maybe a brighter light bulb, say a 200W clear incandescent on a dimmer, so you can go from ambient lighting to "I was taking apart my watch and lost a screw" kind of lighting with the turn of a knob.