Hood Hinge push on washers ??

I went to napa and picked up a package of 1/2" and 7/16" "push nuts". They looked exactly like the retainers on disc brake rotors. They were thinner than the originals and a little bit different shape of tooth on the inside.

The 1/2" push nuts that I got from Napa were too big. They were barely snug on the shaft. The 7/16" push nuts were very tight. I pressed on both hinges and bolted the hood on. The first time that I pulled the hood down one of the push nuts popped off the shaft!

I figured I had a bad one or something. I replaced it and tried it again. This time one on the other side did the same thing. They just weren't going to work for me. I ended up ordering the reproduction retainers off of ebay. SO FAR... I haven't had any trouble with them.

http://www.ebay.com/itm/MOPAR-A-BOD...Parts_Accessories&hash=item3a7d1059bb&vxp=mtr