I just had the shocks rebuilt on my BT7 and was surprised to find that four of the front shock mounting bolts had one pattern and the other four had a different pattern. Unfortunately, I didn't pay attention to the patterns when I removed the shocks so I can't say if one style was on the left side and the other on the right. I do know that these are original to the car, because I've had it since it was 3 years old and the shocks have never been off before. I assume Austin must have sourced the fasteners from different manufactures. I can imagine the fellow who installed the left shock had one brand of bolts in his box and the guy on the right had a different brand.