Sorry if this is a repost, I did a quick search and didn't find anything posted about it in the last few months so here it is (X-post from M3forum.net).
The F10 M5 6 speed knob is (almost) identical to the ZHP weighted knob... best of all, it's LIGHTED using the same white connector!
P/N: 25112284205
$124.52 through Tischer!
ZHP knob for comparison