'71 road runner 383 Factory Valve Cover Fasteners?

[road robert]

Please help - in the process of replacing leaky valve cover gaskets I discovered that 8 of 12 bolts appear to be correct OEM w/ captive washer but 4 were different type (not correct no captive washer and head markings different). Then I started to research and found a kit on e-bay that has 8 bolts w/ captive washers + 4 studs + 4 nuts w/ captive washer. What is correct from the factory?

https://www.ebay.com/itm/64-74-NOS-...712584?hash=item3aeb4bbd48:g:UQIAAOSwnDZT7WqM