Please disregard the fact that the picture is a green LED. You are buying red LEDs. Red diffused 5 mm half-round lens, 24 mcd at 20 milliamps over 25 degree half power angle, 50 degree viewing angle. Forward voltage 1.7-2.0 volts, wavelength 647 nm, spectral line half width 30 nm. Half round means it's roughly shaped like a popsicle. $0.60 for a bag of 20 or $2.99 for a bag of 200. This page lets you order 200 for $2.99. Click here to order 20 for 60 cents.
Also consider these similar low-profile LEDs:
Red Version 2 Green Amber
We also have ultra-bright LEDs:
Amber 16000 mcd Amber 3000 mcd Red 1000 mcd Red 500 mcd