Well I think I found it.....but not 100% sure if that's the OEM length.
Bolt size is 8x25 (diameter x length).TPI is 1.25 if I recall correctly. You will need flanged nut
OEM is grade 5, don't think you can go wrong with grade 8. Torque spec is 15-20 ft lbs.
If anyone believes this is wrong please chime in. I'm going to hardware store tonight before I start my drive back home.
For reference, I live where you guys like to drive the 4runners on trails. IE. In the middle of the no where lol 1 screw up and it costs me half a day minimum to get a bolt.
Found it here:
Body Lift Installation Instructions