I'll measure the depth soon but 6" seems like what I have. It's odd because I asked the salesman about it and he said they'd fit and even had a story...
Technically it's arriving at the dealer today but then it's getting tinted, surf pipe install etc. so I won't lay eyes on it until mid-next week :(
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So the dealer specifically recommended that prop option, they claim it works better with the 400 motor. We will see. Of course, I don't have anything...