Looks to be discontinued, but there are Tundra/Sequoia ones available
OEM Front Skid Plate with Mounting Kit for 03-07 Toyota Tundra Sequoia New | eBay
Wonder if it might be easily possible to make other brackets to fit a 4Runner or modify the ones that come with the skid? I've actually never seen the one you posted, so I might look into this as an option to retrofit the Tundra one.
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2004 4Runner V8 Limited - TRD Exhaust, LED Interior Swap, Pioneer HU, Tacoma TRD Front Suspension, FJ Rear Springs, 10" + 32" Light Bars, Prius Shift Knob, 275/65R18 Falken Wildpeak, 18x9 Level 8 MK6 Et0, GOBI Ladder, 06-09 Headlight Swap, TOTALED NOV 2019, RESURRECTED APR 2020
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1998 Volvo S70 T5 - Custom Airlift Suspension, BBS Nebula Wheels, Brada Seats, Engine Bolt Ons -
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2010 Subaru Forester 2.5X - Wifes Car