Did that this weekend
Will try to post pix later.I sail a 26D, so should be the same setup. I actually placed mine slightly forward and outboard of the originals (which I removed.) Probably 6" forward. From what I've read and experienced, placement depends a lot on your sail (of course) but also in how much wind you typically sail in. Some people actually place multiple tracks in order to dial it in. My reasons for going forward were these:- my sail's a 135, not a 150- the track's 2-feet, so running the cars at the front of the track now let's me trim the sail well when reefed. I can pull the car back and trim well when fully unfurled. It's a compromise, yes, but a reasonable one I think.I sail in an area that gets steady and strong winds most of the year, so I will reef often and felt no need for a 150. I also wanted to place the track forward enough to handle the sail well when reefed. One thing to note if you're replacing the original track is the width of your car! My plan was to put my new track right over the old. But when I tried this I found that there wasn't enough space between the edge of the track and rail for the edge of the car. That's why I moved the track outboard a bit from where the original was -- probably by about an inch. This also allowed the holes on the INSIDE of the cabin to be spaced far enough from the original holes to plug them easily with new plugs.Will try to post pics tonight.