NOS Triumph 2000 Leyland hub cap part number 130579.   It is similar in design to the herald rim but has a place for an added wheel badge. Upgrade your herald with an original part with an added wheel badge.  They have a 9" diameter and he caps will fit a Herald rim but I am unsure of the TR's.  I believe the early Spitfires have the same rim as the Herald.   

This cap has some corrosion in the chrome, see pictures.  Thank you for looking.