Really, I should start grabbing them from differentials when I see an Opel headed to a crusher.
I can tell you that there's a bearing race that will work but you'd need a good thickness spacer to use it. I don't remember if I ever found the correct size bearing though.
I went down the rabbit hole yesterday looking at this swap. I'm particularly interested in a simple LSD swap not for racing but for snowy roads since I'll probably try to drive my GT in the winter too. I figured an LSD should half-way compensate as traction control. But, figuring out the exact...
The carrier bearings are still available from RockAuto, National 19150 and 19268