Yes, this is possible and very easy to accomplish due to the size flexibility inherent in our Modular system.
Added to the Modular Windshield 4 (330mm), a Modular Extension 4 section (260mm) will bring the total basket length to 590mm. This equates to the size of the Modular Windshield 8, which is the solution we recommend for the 816.
NB: If a Windjammer® is required for both basket sizes, a Windjammer 4 and Windjammer 8 will need to be purchased separately: one size will not fit multiple baskets. Please also note that the Windjammer 4 is included as part of the Modular Windshield WS 4 Kit.
Relevant product info:
Modular Windshield WS4 Kit
Windjammer 4 or 8