What size mantle?

The width of the upper wall is 62 and 1/4 inch. The width of the wall covered by stone is 66.5. If we order a standard mantle the size would be 48 or 60 inches. We could also get a custom one on Etsy that would be 62. What would you do? Also what depth? 6 inch ? Thanks for the advice.

The width of the upper wall is 62 and 1/4 inch. The width of the wall covered by stone is 66.5. If we order a standard mantle the size would be 48 or 60 inches. We could also get a custom one on Etsy that would be 62. What would you do? Also what depth? 6 inch ? Thanks for the advice.