Windshield lock strip question
 

I just bought a 1987 Camaro z28. The previous owner removed the windshield lock strip. I have looked up replacements and am confused as to the difference. Most are around $59.99 one is 69.99 but I also found one on a Camaro site for 8.99. should I just buy the common priced one? Why is the cheap one so cheap. The pictures look identical.