>I thought they were made by someone like Joe Breeze, but I
Those were (are) for the four rail Brooks saddles like the B72 and B66. The original adapters were notched and had two longer bolts for Campy posts, the later ones are square and have just one long bolt for regular micro-adjusting posts.
Roy "got one for my honey" Drinkwater Lititz "that's my honey B72!", PA