For a standard case use our special GB 157-157C which have the correct case size (standard Type I OD) with the 411 ID for the crank. These bearings require cutting a tang notch in the case. Easy to perform with our understandable instructions.
Some people with aftermarket cases often line bore the case to standard 411 size. This is not recommended for the stock factory case.
Warning: Never use a line bored case with any Berg crank.
Only a new case will provide 100% life. A line bored case has an extremely short life span, often only 20% of that of a new case. They will never produce as much HP as a new case and often run much hotter than a new case.
Always use a new case.