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That rear is not going to fit very well unless you have some stretch, pulled fenders and camber. This is 19x10 +33 and my rear fenders are rolled flat with a tiny pull. Your specs would stick out another 11mm. If I added a 10mm spacer it would rub like crazy.
what would be a good size to fit the rears
X10 +30?
To give you a general idea of fitment, I'm running a 19x9.5 +29 in the rear. I had to roll the rear fenders to prevent rubbing over the harshest bumps. The fronts don't even come close to rubbing at 19x8.5 +38. This is all on stock ride height and stock tire sizes.
19x10.5 +30 in the rear will fit like this. Granted the pictures shows the rears are not dropped, tires are 275/30/19, 0 camber adjustment, and fenders are not rolled yet. Note the lines on the tires. That's where the fenders rub against them. That will give you a reference point of where your offset should be. Based on my experience, I would recommend somewhere around +40 range for offset.