I looked at the link for metrompg's post. The URL was like so:
/forum/fe-graphs/sig11a.png
I noticed by hovering over his vehicle that it's vehicleid #11. So I looked at my own and saw that it's vehicleid #3652. So I made the swap and put the IMG tags in my sig. Yay for spending years as a web programmer too.
Try:
http://ecomodder.com/forum/fe-graphs/sig3636a.png
http://ecomodder.com/forum/fe-graphs/sig3638a.png