I've got a Eureka Flex and it looks almost exactly like that, the rallysport had handlebars that clamp on to the triple tree with a little four-bolt aluminum plate that says "Garelli". The Flex had a post that comes up and the handlebars are attached to that.
Garelli did make a 20mph version of some bikes depending what state they were sold in, does your VIN plate say what the bike is rated at?