Factoring the radius that the centre of mass is at for the bolts or nuts, any saving could easily be outweighed by a rough balance job with excessive wheel weights installed to fix it when you consider the wheel weights are at the outer edge of the wheel... Some 2 to 3 times the radius of the bolt pcd. .. i could work out the differences but unless you are chasing umpteenths then you are unlikely to notice the difference with the bolts /nuts.
Ed
Do you have a metal valve cap and rubber cap to weigh for comparison?
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