Battery positive post connector.
Similar to that used on many Peugeots and some Renaults in the 70s and early 80s.
This a period part made by Arelco and is better quality than the type more recently available.
We have limited stocks and will not be able to get replacement stock of this quality.
PLEASE NOTE that at some point, (as shown in the 2nd photo), someone has written with a black marker-pen on the red plastic sleeves on all of this NOS (new old stock). If you do not want this writing (approx 3cm by 1cm) to be visible under your bonnet, please do not buy this item.