This website is the passion-project of a USMC veteran/mechanic, @Tyler. I created Tacoma3G.com to share my knowledge of this subject with others and to provide like-minded folks with a comfortable space to ask questions and create 'build threads' within our Tacoma Forums. Now, if the format of this website is confusing to navigate for you, or if you're interested in my full mission and T3G's history, check out the Help and About pages.
Some have a hole drilled in them that you slide the bolt through and they are attached to the bottom of the pack. Others have a notch that slip into position around the pack pin. The better ones are the former but you have to make sure your pins are long enough that the addition of the shim doesn't prohibit a good clamp of the bolt on the leafs.
