Bill, I'm used to being able to make s phone call for this sort of info... Yes, you normally have to call or email the mfr, and you could wait awhile for an answer. Another option is OEM wheel refurb/ suppliers. They'll always have at least the shipping weights available.
If ever comes down to a wheel choice where there's half a pound difference, you can always send the wheels to a machine shop and have the lip taken off each side. You'll just have to get it balanced with sticky weights.
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