I had to look at a ruler to see how big 4mm is. That should work fine but I'm not sure about using metrics on a 52 American made truck! One thing I forgot to mention was lubing the lip that pulls over the pinchweld. We used silicone unless we were in a bodyshop, but I've found that a foamy aerosol glass cleaner works just as well and cleans off the glass better, Murphys Oil Soap also works good. John
