I've decided to add tracks to my boat. Presently, I have two eyepads at mid-boat to which I attach blocks for the jib sheets. This was, apparently, the original 1969 setup, and it leaves little in the way of adjusting while under sail. My problem is in googling tracks, there seems to be a number of sizing options and I am ignorant as to the differences. Based on the size of my boat (24'), I'm looking at about 48" of track. Now, what size track would be optimal?