To place an order paying with Affirm, just add your product to the cart and select "AFFIRM" at check out.
Please provide the necessary information. If you are approved you will see a screen similar to this. Select how many money you would like to pay your loan by.
After you Confirm the loan with Affirm, you will be redirected back to the MGP Caliper Covers website and you will need to confirm the order again on the MGP website.