I don't whether these pics. wil be of any help
, but hey it's worth a go....
As far as I know, they feature the original factory finish (what's left of it), bar the black bits which have been blown in to tidy them up a little- can't remember the part number, but they are the flat late six with the early centre bore hole for a three prong centre cap, date stamped 9/73 from memory
Martin.