1984 300D
I am rebuilding my vacuum pump, including the bearings.

I am wondering what others have found when they tried to get the bearings. I have found it to be rather difficult to figure out all the different choices each catalog lists about their bearings.

My original SKF bearings were made about 30 years ago, and have "SKF 304991a Italy" etched on their side, but I don't see anything in Internet searches for that today. I figure that model number is no longer valid.

The other postings in this forum really gave me a good start (6 ball, high precision, 626, 19x6x6, etc.). They also recommend "grade 50" or better, yet I don't see that information listed in information from the manufacturer. But I do see ABEC ratings for bearings and now understand that ABEC-1 is the lowest rating.

To help others that might have asked the same questions, it might be good to list what others have found when they selected their bearing.

What brand?
What model?
Did it come with shielding?
What was it rated? (ABEC-1 or higher)
Where did you get it?
Approx cost?

For example, my local bearing place said this was the right replacement
Brand: MRC
Model: 36 steel/co/abec-1 051z
No shielding when they showed it to me, even though model said 1z.
About $14.00 each

What did you use when you replaced your bearings?

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1984 300D 398K-daily driver
1998 Honda Accord 102K -wife's daily driver
1991 Volvo 740 289K
2000 Toyota Corolla 143K