differences between rear D60 SRW and DRW

[MysteriousXTC]

What are the main differences on the outers to determine DRW or SRW if there are no brakes attached? I searched for a few pictures but couldn't find any. Maybe someone on here has a couple. Thanks!

 

[BigWheelBob]

I have a couple dually dana 60,s out of 1 ton small vans, and they measure around 73 inches wms to wms.