I don't think the rocker (sill in the UK) trim came as standard on any model?? It was not part of Moulding Group A (A63) which is the extra trim fitted as standard on the SE.
You need to look for the M25 code on the fender tag or for evidence of holes along the rockers (sills) to mount them.
They were terrible rust traps and many were removed for that reason.
Why do you guys call the sills "rockers"?
Where I come from rockers are;
a) Guys in leather jackets and slicked back hair.
b) The things under the
rocker covers that open the valves.
c) Chairs that old people or nursing mothers sit in.