Bullet latches can be purchased from Rockler Woodworking and Hardware,
either from their catalog or on-line store: http://www.rockler.com/ 
They stock two sizes and they come with strikes and pins: (1) 3/8"
diam. x 1/2" L, cat #28464; and (2) 5/16" diam. x 3/8" L, cat # 28472.
Both are good quality, brass-plated steel.

Chuck Schoppe
Los Gatos, Calif.