1 Triumph TR8 V8 engine exhaust part number ERC3985 should imagine it would fit an ST1 engine I seem something similar on a land rover manifold this previously was used on the driver side of my own V8 because there is no downpipes connected to it I think it might be able to be used on either side as well. Looks like the interchangeable from right to left hand side.
One stud missing but easy to buy the threads on the top the manifold that's design for heat shield to screw onto.
Surplus to requirements.
Can be sent by carrier please enquire for price