I have five fittings these work in. They were from store under shelf displays and I use them in my kitchen as under cabinet lights. I have plenty of spares, including four F13 1/2 watt T8 Philips I got from E-Bay, shown here:
http://www.lighting-gallery.net/gallery/displayimage.php?pos=-54975And here are the GE F13 ones I also got from E-Bay:
http://www.lighting-gallery.net/gallery/displayimage.php?pos=-54976