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<p>[QUOTE=&quot;thejudges69, post: 10445352, member: 169272&quot;]I bought a 1/2&quot; thick by 7/8&quot; thick diameter spacer with a 3/8&quot; ID. It&#039;s a steel spacer, and then I bought a 3/8&quot; zinc coated flange bolt and zinc coated nylon insert flange locknut. It takes 94&nbsp; spacers and bolts to do a 53&quot; stepdeck with 14&quot; crossmember spacing. 12&quot; crossmembers would be little over 100. I did every bolt in my tie down track including the vertical ones in the neck. I chose the flange bolts so I didn&#039;t have to worry about washer thickness and as you can see the bolt flange is close in size to the spacer. I got the bolts from McMaster Carr, I&#039;ll get a length when I&#039;m at my shop again. If you do a bolt and nut setup, you need to know your thicknesses before you buy. I have about a 1/16&quot; clearance below the floor. But I&#039;m below and that is what matters.</p><p><br /></p><p>From the factory Doonan uses stainless bolts for looks only. I asked Kelly at doonan his thoughts and he highly recommend the grade 8 bolts if your ok with steel bolts. Stainless steel 3/8&quot; bolts have a tensile strength of 70k psi, where a grade 8 is 150k. The bolts are going down through the floor into the crossmembers with the nut on the bottom so that I could keep it below the floor. This method keeps it below the floor so nothing will catch it. If I put the nut on top the bolt will stick up above the floor. Kelly expressed that it doesn&#039;t matter what direction the bolts going as long as it&#039;s tight and below the floor.</p><p><br /></p><p>You shouldn&#039;t use any bigger spacers then I have simply cause the spacers won&#039;t fit. The 7/8&quot; spacers can go into the rail standing up and will pivot with just enough space to lay over. Anything bigger won&#039;t layover without some grinding.</p><p><br /></p><p>If you buy what I bought you won&#039;t need to do any modifying. I used a 1/2&quot; impact on top and a wrench underneath for removal. The wife ran the impact, I held the wrench, we did 3-4 at a time. We then tightened them with a 3/8&quot; impact cause doonan has a torque spec on them bolts and a half inch will exceed the torque and break bolts. It took us 2 hours cause we had to move bridges and tarps. </p><p><br /></p><p>Here is a link to the spacers hopefully the link works.</p><p><br /></p><p><a href="https://www.aa-mfg.com/product/aa-648-a-steel-bushing-7-8-od-3-8-id/" target="_blank" class="externalLink ProxyLink" data-proxy-href="https://www.aa-mfg.com/product/aa-648-a-steel-bushing-7-8-od-3-8-id/" rel="nofollow">AA-648-A Steel Bushing, 7/8&quot; OD, 3/8&quot; ID</a></p><p><br /></p><p>I&#039;ll get you links to bolts and nuts also. I should start charging for this since doonan may entertain my modification as well .[/QUOTE]</p><p><br /></p>

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