Rear track bar question

[Adam4pt6]

So I think I messed up... I'm about to lower my 69 c20 6 to 7 inches in the rear and ordered an adjustable pan hard bar for the drop. However, the new one is 24 inches, and adjusts to about 26 inches max. My factory one is 27 Inches long. I didn't measure before hand, and ordered one listed for my year c10 AND c20. And now I'm wondering if I goofed and got one that's too short? Obviously I'll find out when I do the install, but right now I'm waiting on bad ordered spindles and if this is the wrong part I want to return it now with the hopes that the correct one can just come with the spindles when they ship.

So, did I drop the ball on this one?