I got shoulder belts from a 93 Toy pickup off eBay. Make sure you get the receiver end too. The roll bar is threaded to receive the shoulder belts. Just pop off the plastic covers. The shoulder belts screw right in to the roll bar. It's about a 10-15 minute mod once you have the parts. I need to take better pictures.
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1989 4Runner Build thread:
http://www.yotatech.com/f199/nervo19.../#post52231244
2000 4Runner & 2000 Tacoma TRD Off Road
2008 4Runner & 2016 Tacoma 4x4 Dbl Cab TRD Sport