EA Srl.
Lampholders and other parts for lighting products.
http://www.easrl.com/

Mitronix Inc.
Mitronix is your source for standard and custom lampholders including wedge base, bayonet, MR16 & G4 halogen, RSC and minican, T5 & compact fluorescent, reflectors and LEDs
http://www.mitronix.com/

A.L.P. Lighting Components
The maker of lighting components including: lampholders, retrofit kits, adapters, louvers, reflectors, compact fluorescents, lenses and diffusers.
http://www.alplighting.com