Ingredients for the custard éclairs:
68g butter
75 ml of water
75 ml of milk
12 g of sugar
2 g of salt
125 g of eggs
90 g of flour
For the pastry cream:
The recipe is not complete on the page you provided. There appears to be a continuation on another page, but the link is not provided.
I recommend checking out the original recipe for full instructions and missing ingredients for the custard.