Mystery GC Springs

[caffeinatedsoap]

I've salvaged two sets of GCs together into one kit.

The front springs are GC150.64.53 . I've found these to be 300lbs.
The rears are 0500.225.0575 . I can't find what these are.

[whodwho]

GC150.64.53 = 6" free length / 2.5" inner diameter / 300lbs
500.225.575 = 5" free length / 2.25" inner diameter / 575lbs

[caffeinatedsoap]

GC150.64.53 = 6" free length / 2.5" inner diameter / 300lbs
500.225.575 = 5" free length / 2.25" inner diameter / 575lbs

Thank you sir!