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The diameter washer I used is 4 1/2''' inches i picked up at my local hardware store, the only catch is you want the center of the washer to be just big enough for the bolt to go through and keep it centered otherwise if the center of the washer is too large it might try to move around as time...
Just thought I would add that I did the fix to the two rear cab mounts only I did not mess with the other cab mounts. I have not experienced any negative effects on the fix.
I read somewhere that power tools should not be used when loosing or tightening the cab mount bolts, I think that there is a possibility that power tools might break the nut loose that the bolt goes into on the cab floor there either welded or use some sort of tabs to keep them from spinning...
Might be hard to see but the rubber matting is sandwiched between the Big black factory washer and the mount I did a quick trimming of the rubber to match the diameter of the washer also added a large washer on top of the factory black washer i think without the added washer the factory black...
I had 8000 miles on my 2019 2500 6.4 4x4 when I purchased it, the truck rattled & clunked when I went over washboard sections from day one . I recently saw the Ram 2500 YouTube video showing the rear cab mount rattling when hitting washboards I noticed the cab mount bolt seemed too long...