hey bryan, revell will replace your part free of charge. the only time it becomes a problem is when you try to order multiple things and then the next time you have to start paying for parts.
i would suggest downloading a new web browser...
http://www.mozilla.com/en-US/firefox/personal.html
or
http://www.google.com/chrome/
either one of them will work fine
heres a link to the pro street stuff on ebay.
http://toys.shop.ebay.com/i.html?_nkw=pro+street&_sacat=2580&_odkw=&_osacat=2580&_trksid=p3286.c0.m270.l1311
i believe this is the yellow one that niko is talking about. the frame to the nova can be modified to work with many 1/25 scale cars. the same with the 55 pro sportsman. both pics are same kit just different box.
i would try using amt's '66 pro street nova. both amt's nova and revell's datsun are the same scale.
http://cgi.ebay.com/AMT-Parts-1966-Nova-Pro-Street-Chassis-Wheelie-Bars-/370446139993?pt=LH_DefaultDomain_0&hash=item56404f8259