Just look like 6112s to me but not sure ?
I'm guessing it's some variation of a 5100. It looks very similar to the bilsteins that RCD sends out but they only offer a 4" drop bracket kit for the Tacoma. 4" Lift Kit w/ Bilstein Shock Absorbers - Toyota Tacoma 4WD & 2WD - Race Car Dynamics
My only other guess would be that they could possibly be from a Fabtech suspension kit.