How to order new package with CableCARD?

I want to order a new Comcast package via the Comcast website.  My hope is to get a slight change to my existing service, in which I am already using an existing CableCARD.

When I go through the website, it says that I can use my own device for both the internet and for the TV.  I assume the TV is referring to a CableCARD-based device.  However, on the checkout process, it is REQUIRING me to choose either a "DVR Service" or "Service with TV Box" .  It says:

"Please add at least 1 more TV box to continue."

Immediately below this, it says "Want to use your own TV equipment? View Compatible Devices."  But there is no option to use my own TV equipment.  The link there brings me to an FAQ page, and no options are available to select my own TV equipment.  I am forced to choose a TV box to enable the process to continue.  I DO NOT WANT A TV BOX!  I want to use my own equipment.

Please help me set up a new package with my own TV equipment - specifically, with the CableCARD I already use.