Kicker shaft length question

[keith]

Hi All,

I have a 72 23' Seacraft SF with an I/O and I want to add a kicker to it. I'm looking at the Yamaha 9.9 high thrust but not sure about the shaft length. They have regular, long, and extended long (I think that's what they call it). To mount the bracket I think I have to cut into the bait bins. How far down should the kicker hang below the bottom of the boat? Has anyone done this and have advice for length of shaft and/or bracket height?
Planning on cutting the swim platform where the bracket will be going.
Here is the bracket I have. https://adventuremarine.ca/product/h...motor-bracket/


Thanks,
Keith