Sheared off lower coil mount bolt

[Buckthetruck]

I started working on the rear suspension of my ‘65 C-10 today. While working to remove the lower spring mount plate, the bolt sheared off! The top came off fairly easily so now I am stuck. What is the best way to get the lower mount off? How much tread is on the bolt of I cut off the welded nut? Will it just com off then? Is it possible to “twist” the coil to remove it from the bolt? It is rusted on pretty good. (I think I have attached photos)
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