Washington Tractor is selling this:

John Deere MCS6

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Fits the D100 Model Mowers.
The New MCS 6 Attachment is designed to provide dump from seat grass collection/expulsion for all John Deere 100 Series tractors equipped with the 2 bag Material Collection System (MCS). The MCS Attachment eliminates the need to get off of the tractor and empty the bags
as a result it will increase both efficiency and cleanliness in the mowing process. The lightweight aluminum body is light weight and easy to handle. Conveniently located lever and smooth release and latching system are easily accessed from the tractor seat. Because it is engineered specifically for the John Deere Material Collection System
installation is a breeze with simple hand tools.

$1,082 USD $499 USD $2,250 USD