All U69 Jack Bases on E Bay at the present time are for 1969 Camaros. Item Number 120371723100 is one example.

Snoopy your post with the T Type Jack Base I believe is for a 70 or 71 E Body with a T Type Mask.I am thinking that your U70 Base might be for a 1970 GM. I have a U69 Jack base and it goes with the 1969 Camaro Jack Assy I have.