Robert,
Everything that you would ever want to know about EMPI is here:
www2.cal-look.com/nostalgia/risefall.html
It's a three page article on the origin, history, demise, and rebirth. At one point in time it was the formost developer and manufacturer of performance parts for air cooled VWs. Now it's little more than a decal.
Every dealer of bling and shoddy chrome crap out of India and South America counts itelf as an Empi Dealer. CIP1, SO-CAL Imports, any of the advertisers in Hot VWS will carry the nipple-style caps for both four and five lug wheels. They're all junk! The crests are crumby repros with a strange looking horse and no PORSCHE or Stuttgart lettering on them at all.
Buy Alan's caps and (if his crests aren't to your liking) pay money for the genuine crests from one of the Porsche parts suppliers and you'll NEVER look back! Every time that you wax the car, or wash the wheels, you'll just smile like CRAZY!!
:) Like I'm doin' right now lookin' at MY hub caps!
TC