SPIRAL WINDOW SPRINGS NON TILT

I NEED TO ORDER SOME REPLACEMENT SPRING WE HAVE A CONDOMINIUM WITH ABOUT 500 WINDOWS WHICH ARE VERY HARD TO OPEN . I HAVE ENCLOSED A PICTURE OF THE PRESENT SPRINGS THERE ARE 4 SPRINGS ON EACH WINDOW 2 ON EITHER SIDE . THE WINDOWS ARE HEAVY IMPACT SINGLE HUNG APPROXIMATE WEIGHT I WOULD GUESS 60 LBS FOR OPERABLE WINDOW . PLEASE ADVISE WHAT COLOR SPRING I WOULD NED . IAM THINKING BLACK TIP length is 38 inches for taller windows and 36 for the rest

thanks
Gabriel

Thanks for the reply Sooner the better we need to start replacing springs in models that function

Let me know if you need any additional info

or pictures

Gabriel

I will take a picture and send it over its a strange set up

Please see attached part you requested window shoe . I took out the sash and removed it one pic it is installed Please let me know what we need to get goiung

thanks
Gabriel

Thanks sooner the better

Gabriel K

On the 500 series springs what color tip do you recommend Can I use the existing pivot shoes that are there or do I need to use the 17-011 clip
Look forward to the answer so that we can place the order

Thanks
Gabriel