71 Charger Disc Brake Parts

I'm missing 2 caliper positioners for my 71 Charger. They're little clips that go on the hex side of the bolt. Are they needed and if so, where can I get them?

http://www.n96airgrabber.com/products.asp?cat=15

Most cars do not have them or the anti rattle springs either. The brakes will work fine without them but they were put on there for a reason.

Thanks for the info!

In forty years Ive sen very very few cars with them.Mne have been on 10 years at least without them.No problems.They are kid of like those little rubber band pieces you get with some.Not needed.Rocky