I think that you are confusing the BMW bearing with the type 4 size.
The type one bug crank main bearing journal diameter is 55mm (2.165"), the type 4 is 60mm (2.362") and this particular Ford journal is 2.750" (69.85mm).
Typically most people that use an "adapter" bearing to fit a type one crank with type 4 center main into a stock type one case use a BMW bearing that is a thinner shell then the stock type one bearing. This allows the 60mm center main to fit with no machining to the case other than creating a couple of notches for the tabs on the bearing. Another method would be to line bore the case to the larger type 4 bearing. There is also a Chrysler bearing that has the same journal size (60mm).
Since the stock waterboxer crank uses 60mm at the flywheel (#1 bearing), 55mm at the center (#2 bearing) and 55mm at the cam gear (#3 bearing), I had Jose at DPR make mine 60mm at each end and the almost 70mm in the center.
The Ford main bearing compaired to a stock waterboxer bearing...
One last thing to keep in mind is that a lot of stock replacement bearings are not of the best quality. However, in some of the domestic V8 stuff, you can get higher performance racing bearings. Hence why I went with 2.100" Chevy rod journal sizes. VERY good bearings are available in that size!
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