So the BEST option I found was to go up a size on both the front & rear 19s to a tire size that is more common AND equal rolling circumference. In the example below the front AND rear have equal rolling circumference. This is the most ideal for the xfer case as to preserve the clutches and also gives plenty of tire sizes that match both front and rear brand/model/etc.

Matching same tire brand/model is important as no two brands nor models are going to have the same wear characteristics.

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2003 BMW X5 3.0i -- MT5, 3.64s final gears, H&R lowering springs, K-Mac bushing kit
2007 BMW X3 3.0Si -- MT6