Pillar 2A 128 with early link 2A 497:

In use:

Later pre-77 link 12 H67:

77 and later link 12G 2627:

Rear mount 12H2 517 for alternator, 12A 526 for dynamo is similar:

The sliding (interference fit) bush in the rear ear, positioned between its two extremities with the bolts fully tightened, also shows the adjuster slots in the rear bracket bolted to the block:

Extended rear bracket when converting from dynamo to alternator: (Motaclan/Leacy)