Thanks for posting. We are currently researching possible replacements for that top pin of yours. In the meantime, however, I would like you to take a look a few parts and compare their measurements to your existing hardware. Please look at our 21-018
Bifold Fenestra Top pivot and our 21-019
Fenestra Bifold Bottom Pivot, as well as our 21-161
E-ring and 21-256
cone spring. Do you think these would match your current pins? Please let us know!