Guys ,they are almost identical but all of the through fixings on our borrowed part are ”bolts” and in plain steel it looks like some of the through fixings on Hindenburgs part are alloy rivets?
also there are no brass components on our part , it is alloy, wood, stainless central bush, and steel bolts. I will keep looking for a number , differing materials may perhaps just be down to modification though or the part could be one of several bell cranks doing similar tasks. Kev