Ricardo.
Nardi is semi-tits up, maybe for awhile, maybe for a season... we will see. To try and answer your question visually go to www.nardiusa.com which is a company called Perfect Motion here in the USA... they have all the current knobs, buttons, attire, and wheels on a great web site. They have what's left of Nardi's inventory. They also sell used wheels... at a hefty price according to the style and history. They maintain a site on E-Bay.... just look for Nardi.
I have an Evolution style Shift Knob on my VS, and the wheel that JPS and VS use as the standard Nardi is called the Classico. They are currently modifying a shift knob from a Nardi to Porsche crest for me.
Hope this helps.
Jim in OKC