if you need something now, you have a few options:
1. get the 05/06 tacoma ARB bumper and retrofit it to fit to your 4runner. It will require refabricating the mounts to the frame but that's about it. Everything else should line up I believe. You might encounter issues w/ the bars lining up with the headlights but when you're rebuilding the mounts you can adjust it accordingly then.
2. goto some fabricator and have him make a custom bumper
3. wait for ARB. - will be A LONG time (I'd say atleast another year or so)
www.bentup.com
My buddy owns the company, they make great custom parts made to your liking. Might cost a little for shipping since he is here in Northern California.