You would need to buy the two spacer kits for the S sold separate in the service manual. The kits will come with the spacer and longer screws. AD400 needs two spacers; AD 200, 250, and 300 only need one spacer.
Spacer Part Number: 46929238
Update: AD400 Also needs Spacer, Inside Wireless Cover, AD-400-993-S – Part number 46929246
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