All the cars I have seen are hex in the early 3000 series.
Sal did a great rendition however the accuracy of 47 and 50 are hard to dispute.
3047: Jack bought the car with a fresh coat of solid blue. The car had FIA gold wheels and had nothing missing from the Carter Getty days. The stripes were added by jack and Paula one Saturday afternoon with shaker can white and masking tape. From what he had told me the car was very complete and untouched. Wanna see picture in blue pre-stripes?????
3050: Also another untouched with painted bolts..
Never felt the machined bolts were correct as that was extra $, anyone in MFG knows time = $$$. Didn't make the car faster.
My vote = bolts
Here is 47: