Let's try this.  I know what I want, just not sure what I need.

I have an Ascend FS128T kayak. On the kayak, there are two accessory rails, one on each side of the seat, mounted on top of the kayak.

I am looking for a rod holder that slides on to this rail.  But I am not sure what parts I need in order to acheive this.

I saw this holder online which is exactly what I want.  It holds a spinning reel or baitcaster.  BUt I am not sure what all parts are needed to mount it in to these rails.

Can anyone provide some assistance on this?

Here is what I am after: http://www.scotty.com/fishing-gear-equipment/rod-holders/bait-caster-spinning-rod-holder.htm

Go to amazon and put in Scotty head gear track adaptor. I put fm175 yakattack rail mounts on my boat because I have a flat gunwale with no round gunwales to mount a rod holder to. I bought 4 of these. Hope this helps.

I will attach this link http://www.rammount.com/part/RAP-B-354U-TRA1. It will take you to the ram mount website. They make a ball that will slide into the track and from there you can add this rod holder http://www.rammount.com/part/RAM-117U.  Ram makes all kind of accessories that slide into that track to hold a cell phone, fish finder, tranducer arm, etc. For the most part Ram is the best around right now. They are pricey but make a nice product.