I just finished installing a Harken windward sheeting car and compatible track on my 1982 J30. I used the high profile track (part# 1618 1.5 metres long or 59 inches)I mounted this on a piece of purpleheart hardwood that was 5/8th inches thick, 2 inches wide and 59 inches long. This sort of elevation is required so that the car can slide unimpeded. The end blocks that slide onto the track ends are part # 1631, this set up will give you 4:1 purchase which should allow Mr. Burns of "Simpson's" fame to pull the car to windward. The car itself is part # 1636. By the time the smoke settled this was $1,000.00 plus upgrade.