[Pillow]

The 4 bolt pattern is the same but the outer bearing is different for the swing than IRS.

The OD for the IRS bearing is 2.865" where the swing axle OD for the outer bearing is 2.840".

That is not the problem really since the smaller Swing bearing will fit in the IRS/944 cover.

The real problem is that the IRS/944 cover needs machined down because the swing bearing is wider. Notice on the stock application ther is the drum backing plate sandwiched in there with two paper gaskets. So you need to plunge the depth of the drum plate and one paper gasket. I am not sure of the exact measurement though.

So it is close but needs a little machine work with a pluge cutter.

Also when doing this for a 944 conversion the 944 hub needs machined down the same amount to keep the rotor/caliper allignment perfect.

Take Care,