The ring on the bottom of your shiftknob should be touching your shift boot (that is if your shift boot is pretty new). Momo boots are only $50 or so... a little bit more than other boots.
I used to have that space on my old 240... I just put hair scrunchies over it. <img src="http://www.zilvia.net/f/iB_html/non-cgi/emoticons/smile.gif" border="0" valign="absmiddle" alt=':)'> But I'm a girl... I can do that...