I posted this awhile back - I used these on a set of INDY EZ-1 heads

You can order ARP stuff and make your own kit - these are Summit part numbers - I just used these for my HS rockers

ARP-200-8556 WASHER 10-PC comes in a package
ARP-300-8332 12 PT NUTS 10PC comes in a package
ARP-AJ2500-1B STUD 3/8 X 2.500 – you need 6 of these
ARP-AJ3250-1B SHAFT STUD – 3/8 x 3.25 you need 4 of these