Part equivalence?

Are these RP parts the same (as in equivalent or interchangeable):
1) "bearing insert 360 run"
2) "bearing insert 360 jam"

They form part of the Y-bearing housing assembly, and they look *exactly* the same in the .STL files but I can't tell what the exact dimensions are. For context, around here: [dev.www.reprap.org]

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Are these the # of copies I need?:
4x "bearing insert 360 run"
2x "bearing insert 360 jam"
1x "bearing insert 180 Z"


I'm otherwise ready to have these parts printed

The 360 jam bearings have a smaller hole than the run bearings. They grip the 8mm rod and prevent it turning, hence "jam".

IIRC there is a 360 run at one end of the y-axis drive spindle, two in the x-carriage and one in the z-constraint. The other z-constraint has the 180Z. The two 360 jam are on the Y spindle that carries the pulleys. There is also a 180 X bearing in the x-constraint.

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