How can we put a Daymaker in the new Nightrods?

Guys, I am new to HD bikes. Just got a 2016 Nightrod and I want the Daymaker headlight or one of the lights from Amazon. I dont know what the lingo for the A lights or anything else for that matter. I just need to know why the Daymakers or the 5 3/4 lights on Amazon will not fit in the 2016 cowl and if it can be modified to fit. I dont want to use a different cowl or touch my harness.

Thanks!