Do you mean you have the bases already on? You first have to slip the guide on the belt in the correct side of the guide. Then ust snap in the guides with the belts inside them in the big hole, with the leading edge of the guide to the front of the car.
If the guide is tight, youre good. If the guide is loose and snaps easily off, you have to insert a very small Philips screw in the little hole in the middle to open it up slightly. I believe this depends on a slight variation in plastic manufacturing quality.
To remove guide, carefuly pry it off with a small flat screwdriver.
Check the Nova catalogue for 76 and 77 they have pretty good pics. They have them at novaresource.com
Last edited by dlezama; 11th-November-2012 at 08:53 PM.