If you want to obtain maximum concavity front and rear (given that the 10" & 10.5" have the same profile), ideally you would run a 19x10 ET 23 front with a 275-30-19 tire, and for the rear a 19x10 ET10 with a 275-30-19.
Yes, square tire sizes, square widths, different offsets. This way you can achieve maximal concavity on the front and rear and do not need to run spacers.
If you want the front and rear concavity and wheel to be completely identical, then a 19x10 ET23 will do, followed by a 12mm spacer in the rear to flush it out.
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