I have the standard bow rail on my 2006 2520XL and they are 1 1/4". You may want to email Parker and ask to be sure. I assume yours is under wraps (or on order) or you'd be measuring yourself.
I HAVE THE OPPORTUNITY TO GET 4 USED ROD HOLDERS THAT ARE FOR 1.25" PIPE AT A GOOD PRICE. I HAVE MEASURED THE RAIL AS 1.25" IN THE PAST BUT WANTED TO DOUBLE CHECK WITHOUT HAVING TO DRIVE DOWN TO THE BOAT . PRETTY LAZY HUH!!!!. ON SECOND THOUGHT WILL DO A DOUBLE CHECK TOMMOROW BEFORE PURCHASING. WOULD HATE MYSELF IF THEY WERE THE WRONG SIZE FOR MY BOAT.
Parker changed the diameter of the rails. My 2002 has what I believe are 1" rails. The new models have something larger, 1.25 or 1.5. Go measure, or e-mail Parker Marine to get it right.
Measured the rail again this morning. It is a 2004 2120 with standard east coast rail 1" in diameter. Glad I got off my lazy #$^ before commiting to an unfortunate purchase. Never does pay to be lazy or hasty even in the face of a bargain does it? Anyway thanks all for the help.