I found my order info from Opel GT Source.
HD Donut was p/n 7006g
bearing was p/n 7008
The Opel bearing inner race fit the chevette axle extension, and the Opel bearing's outer race fit the
opel donut of course, but the donut was way too big for the chevette bracket.
The Opel bearing is much larger than the chevette bearing and would not fit the chevette donut.
Rick Drake and I both looked long and hard for an alternate source for the chevette bearing... no luck.
Bill