You might best save and/or print the Series 1 E-Type judging guide:
http://www.jcna.com/library/tech/e-type1.pdf
CYLINDER HEAD NUTS AND WASHERS
Chrome dome nuts, chrome D washers, EXCEPT at front of head, at lifting brackets if so equipped and sparkplug conduit which are chrome/cadmium round washers (J30-Pg.16 & J37-P14).
Patrick McLoad
Jaguar Club of Houston
(Previous Owner of)
1966 RHD OTS E-Type
2002&2009 N. Champ
I note the Section 1-E Type 1 technical material highlights 1968 models. I am assuming that it is still the proper section for 1963 Jaguar XKEs. Correct? Thank you for your help.