You might also try some of these...
http://search.digikey.com/scripts/Dk...e=920024-07-ND
They have a captive style that keeps them in place while you tighten the hardware and many have a formed locking surface that keeps hardware tight with vibration. The yellow indicates wire size of #10-#12 AWG. Often these are available at hardware stores and home centers. Used with a ratcheting crimper they are fairly reliable.