You want to replace them with a "Flat Top" LED. These have flat tops with disperses the light at a much wider angle than a rounded LED.
I use these all the time in restores or repairs. You will need a 330 or 470 ohm resistor as a drop resistor. Note, that these come in all colors. If you prefer the incandescent look, get "warm" white. Clear white has that "ice" look. They also come on various other colors. Blue, green, red, are all popular.
Most of these on ebay are shipped from the Hong Kong area. I have ordered several, and they take about a week to arrive.
They also come in 5mm (standard), and 3mm sizes. http://cgi.ebay.com/20-X-5mm-Flat-Top-warm-white-LED-Wide-Angle-Light-lamp-/110416301254?cmd=ViewItem&pt=LH_DefaultDomain_0&hash=item19b5530cc6