Pivot Show ID, Failure cause question

Hello - My uncle installed 13 windows (I think about 20 years ago) that have nearly all failed at this point. I know he sourced the windows from a local NJ company, but I am not sure of the name and I think they are no longer around. The hardware appears to be Swisco from what I can tell though, so I am glad I found your site!

I believe the failures are all due to the Pivot Shoe, not the spiral balances (I only took apart one window, but all the bottom sashes crash down). I have taken one apart, please see the pictures. The top of the shoe is plastic where your new ones have a metal plate. Did mine fail due to the older plastic top design or where they installed wrong? The spiral part seems to be in the center slot of all the shoes, but in your videos it is always inserted into the rear 45 degree angled slot. Does that matter?

Either way I believe all I really need is (2) 15-047 shoes per window for the lower sash. Do you agree based on the pictures? The measurements seem to match the 15-047 as well.

My spiral balances look like 5/8" (they measure 9/16") blue tip, 29" long. The windows are between 57" and 60" tall.

Thanks!
Burt

I think the picture failed to attach the first time, adding it again with this post.