This is another Porsche factory race part I recently located and purchased on eBay, an OEM 911 RSR MFI crankshaft pulley https://pbase.com/9146gt/image/152225821. The small pin is missing, but that's very easy to machine. Contrary to popular belief, these pulleys are "steel", NOT "Aluminum". Note the MFI timing marks used for the BOSCH fuel pump https://pbase.com/image/152225824

By the way, the 906 (Carrera 6) cranshaft pulley does not have MFI timing marks, not unless it was of course the rarer "906E" model.