John Deere Tractor Seat Spring

This is a replacement for the seat springs in a John Deere compact utility tractor, p/n M146683:

https://partscatalog.deere.com/jdrc/search/type/parts/term/M146683

I have a model 2210 tractor, but this part is also used on many other John Deere tractors, listed in the link above.

This spring is quite stiff; I may do a remix with thinner walls for a little more give.