Progressive Rate Springs for GT500?

[kbraitbe]

Hey there, I would love to get some advice on after market progressive rate springs for my 67 GT500 (420-680?).  It appears that most of the manufacturers are out of business and would love some thoughts from this group. 

K

[67411F--0100-ENG.]

Hello,

You may want to look at these.

https://opentrackerracing.com/product/progressive-rate-big-block-coil-springs-1967-1973-mustang/


Thanks,
Eric