You can find your invoice on the website where you have ordered your spare part(s).
Please log in with your username and password.
After you have logged in go to 'My account':
Click on 'My orders':
Open the arrow symbol in the field 'Order', choose 'Posted invoice detail' and click on the button 'Search':
Here you will find all your orders :
If you want to see details of the invoice press 'View details'.