These are not NOS mopar. Its mis-leading. They are AFTER MARKET replacements. I had a 1/2 a set from a 340 I bought earlier this year, along with an extra banana groove shaft. Found an "NOS" set of 8 on eBay and when they came, they were obviously a repo-set. Searched on eBay more and found all kinds of them available.
I did take an original and repo to work to check hardness and size (i work in tool&gage dept) and found them to be good on the rockwell, and about .001 difference on size. Though there are burrs on the inside edges, which will wear out a shaft fairly quickly. You will need to inspect everyone of them and dress them as needed. Also, of the 8 I received, 1 was missing the oiling hole. So I had to drill that out as well.
BEWARE of what you are getting.