Rallye wheel centers 75 Dart Sport

I should know this, but are there different sizes of wheel centers for rallye wheels? I just bought these on ebay without a second thought and I have a sinking feeling that they will not fit.

http://i.ebayimg.com/13/!BtpKFmgBmk~$(KGrHqQH-EIEvq5UN1RJBL8zFTW(4!~~_35.JPG


Thanks,

Jason