Damn close. Just that yours has "spokes" that taper as they get to the teeth. Mine go straight up. Maybe just a different year model? Anyone know how many years they made this bike for?
In any case, if you don't find one and you get antsy enough let me know. I'll bring it to a machine shop and and get a quote to have it copied. Since my last debacle with a machine shop I've met a guy who has a friend who owns one.