Hi Dirkco
The over-riders are definitely not aluminium, they are heavily chromes items, so I really don't know the answer to your question, they were fitted to the car when I bought it. Looking back at the photos from Australia when the car was finally finished its restoration in 1983 they were certainly fitted then.
Checking the parts manual there are similar items on Plate T number T24 part number 42005 with part number 42024 being the rubber.
I will have a good look this year when I am at the SARR at The Falkirk Wheel in May.
As much as I would love to go to The National I doubt very much if I will be able to make it along as I am usually very busy at that time of the year with work commitments
Here is a picture of Royce Cole at the Castlehill Show in 1983 with over-riders fitted
Further investigation from a picture I took two years ago at Thirlestane Castle shows the rear of a few P2s and they also look similar.
