Yeah, I was thinking same thing welding ball stud. Dont want to remove one from other latches as they are in great shape and complete. I'll do some digging.
Steve, another option is to tack weld that ball stud drilled off the other latch onto the 1970 latch. Theres always a way to mod this stuff. If that's a 70 latch. I bet all 69 2 door A bodies have the ball stud mount for the door handle linkage.