Green Wheel bearing help

Didn't want to open a new topic on this as there are already several on the subject of Green bearing safety. After doing some research on this I've found that, while most (all???) new cars use rear ball bearings, they usually (always???) use a double row of them ... that is, two separate rows of ball bearings.

Some older vehicles - as I think someone already mentioned - used real sealed ball bearings. But I could not locate information as to weather they were single or double row though - but by their width I am imagining they were single row.

I also could not get any information on whether the 'green' bearings are single row, but for the same reason I would think so.

So comparing these with what newer cars are running I think is an unfair comparison.