I ordered a new oil bush for my 1970 TR6, and it was the wrong item.
I contacted the supplier, they were very helpfull and indicated I have a very early TR5 block (engine # CP103E).
Since many (most) components are inter-changeble, I thought I would post this as a heads-up for others with an early CP block.
The left item is my (early TR5) bush, the right side one is the later TR6 bush.
The bore (ID) is the same for both items, my old bush was worn a bit), and since I had removed it for proper cleaning of the oil galery, decided to replace it.
I ordered the correct bush (original stock), it is on it's way.