Here's some more research
column part numbers
C17648 3.8
C20558 3.8
C20158 3.8 w/o tab
C23053 4.2 w/ tabs
Jaguar Lucas
C16069 34361 Early 3.8 to chassis 850726RHD 879551LHD roadster
861198RHD 888767LHD coupe
Jaguar Service Bulletin Q67 Aug 1963
C21710 34662 Later 3.8
C25254 34791 4.2 up to 1E1457RHD 1E12033LHD roadster
1E21206RHD 1E32200LHD coupe
C25256 35531 1E1458RHD 1E12034LHD roadster
1E21207RHD 1E32201LDH coupe
All 2+2
It seems that it is easy when ordering parts to get a mis-match
After trying a few combinations- This all works together- Easy, once you get the right combination of parts
tabbed housing with "full circumference" turn indicator
Good time to check horn button operation, since it is all easy to at this point
Now my column is complete, on to the next item
