quick wheel help needed

I ordered a set of bfg at 30x9.5 on 15x7 with 4.5in backspacing, I got a call and they are out of stock on them. I was offered 15x8 with 4.5bs or 15x7 with 3.75bs. Which should I go with? I dont want the tire to stick out of the flares much if any. Pics would help.

Thanks
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When will they be back in stock with 4.5 BS? You don't need 15x8 and I don't think you personally want 3.75 BS. I would wait. I'm assuming this is going on a stock XJ.

I would look elsewhere to find what YOU want, not what they want to sell you of their leftover inventory.