certainteed double hung window pivot bar

hello, i purchased a pivot bar from you that i thought was close enough even though the dimensions were slightly off thinking it wouldn't make a difference but it does. i purchased the 26-353. the thickness makes it so that the window doesn't quite close enough to lock. i was also looking at 26-175 and it looks a little different but again the dimensions are close. it does look like the part that goes into the pivot shoe is offset. mine are centered i believe. i'm not sure this would affect the pivoting of the window. if you could help that would be great. thanks. i'm not worried about returning the wrong one because it doesn't cost very much. i just want to get one that works.