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Ack, I'm on the spot now. I'm not an engine builder!
I've never heard of the rebuild bearings. They're only one set of part numbers in the catalog.
Most engines I've seen were GGGGG, but I did see one GGYGG. And yes, that one had a yellow shell in it.
The bearings are spec'd from the journal sizes. The specs are as follows:
Yellow = 59.984mm (-0.000mm, +0.006mm)
Green_ = 59.977mm (-0.000mm, +0.006mm)
Violet = 59.971mm (-0.000mm, +0.005mm)
Here's how I think you can do it. Measure your main journals. If your journal is:
2.36155 - 2.36180 = Yellow
2.36130 - 2.36154 = Green
2.36105 - 2.36129 = Violet
Less than 2.36104 = Get your crank fixed.
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