I have a 66 Plymouth Dana under my Savoy and the caps look really thin to me.I put ARP studs on them and have a support cover because my car is a stick and it's heavy at 3570#
From some of the close-up pics of the new S-60 the caps look twice as thick as the caps in my stocker Dana.
Gus

64 Plymouth Savoy
493 Indy EZ's by Nick at Compu-Flow
5-Speed Richmond faceplate Liberty box
Dana 60