Originally posted by GregAmy@Nov 7 2005, 10:02 AM
Reference point: according to the Total Seal catalog (http://www.totalseal.com/pdf/TS_2005_Catalog.pdf):

1.5 mm top
1.75 mm Second
3.00 mm oil
84.00 mm bore
STD 20 30 40 overbore available
[snapback]64789[/snapback]

Deves rings has the same specs for OE replacments.

http://www.deves.com/devesrings/cars_BMW.html