Post-Mk3 tonneau - UK version?

[Michael Nugent <nugentmd@gte.net>]

I've seen pictures that show lowback seats (no headrest) in UK (or Euro)
MkIV Spitfires.  I assume they didn't use the MkIV tonneau with headrest
pockets that was used here in the US - did those cars use the same tonneau
as the Mk3, or was there a MkIV no-headrest-pocket tonneau available?

Also, I've heard the snap (popper) pattern is not the same between the Mk3
tonneau and MkIV tonneau - true or false?

Mike
Renton, WA