That's the main bearing ladder bolts. An older version of the manual appears to imply that one can reuse the main bearing bolts, but to not resuse head bolts.
A later version says to not reuse either main bearing or head bolts.
However I believe Nev also reuses both bolts without issue. I have too. There is also the option of the ARP headbolts.
P.S. previous post was removed as I had a few errors in it, but Mike quoted it too soon.
