Bongo Seats in a Custom..

[Ian Cads Custom]

Hi,
New here, at least posting, after a while lurking...!
I've a 2018 L1 Custom that i'm looking at swapping out the rear 3 seat bench and replacing with a bongo sliding seat set up so I can fold it down, recline, slide about etc etc!
There's a few mentions on search about the completed jobs but i'm hoping someone has some details and / or experience on fitting the rails just so I can get my head round it. And any pictures would be really helpful as well!
Current thinking is were should I be drilling, or not!
Thanks for looking,
Ian