The 1991 DR350 wheels I bought for my 2001 DR-Z250 had the same issue.
The wheel bearings had the same OD but a smaller ID to match the axle. So the replacement wheel bearings I fitted were the same as the newer spec. Easy. Also I had to get an engineering shop to ream out (on a lathe) the bearing spacer in the old wheel to the larger diameter.
So all may not be lost!
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