Fly20
I don't know about the 20' [img]images/icons/confused.gif[/img] I think you'll find it both ways but installation on my 23' I had to go the one pop-up in the center and the two trim pieces because the depth of the pop-ups would not allow placement to the outter edge without hitting the bow curve inside and then I couldn't attach the drain tubes [img]images/icons/frown.gif[/img]
http://www.theboatzone.com/gallery/CSteele/res8259