I have had several over the years and I think my wife and I have 8 or 9 right now of that vintage. I have the correct ones you need not be troubled by that. I saw the pics and I'm with you that you only need the bottom halves. I just noted needing to keep the top halves as that's where all the moving pieces and parts are that I will someday use. It is a slight hassle but my wife and I like to help other members with parts that we will probably never need. Believe me I'm an old fart and the last thing I want to do is lay under this car in the grass and take off 60 year old nuts to get these tracks out. They are even one year older than mine...LOL but that's what part of this forum is for!