17 is pretty small for a 10 foot conventional. I've used 18, 20, 22 trigger seats on similar rods. The 20 is the most comfortable. Sometimes I cut 1/2 " off the threaded section of the seat to bring the foregrip closer to the front of the reel.
Get a tape on reel seat - They work just fine, and when you are 100% as to where you want the reel they can be wrapped right on the rod. I like the setup as I can change the reel position untill I am certain that it is home.