27" wheel well fender to ground on rear bags. What length panard bar?

[Low & Slow]

Looking to put in a longer bar for my rear bag drop but cannot tell any ride difference between pre and post bag setup. Still plenty of wheel to fender room and axle looks centered to me.

I was told that I would need on average a 1.5" longer panard bar. How long is the factory bar? Should I just add 1.5" and Call it a day?

At a ride height of 27" from ground to fender how long should it be? Do I even need a new panard if all appears kosher?
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