94 RAM VAN 250 REAR SPRING (LR) REAR MOUNT RUSTED TO HELL--NEED ADVICE !!!

This customer's van is quite solid underneath, except that this rear most spring mount is ready to come apart from severe rust. It mounts outboard of the unibody frame.
Has anyone encountered this and if so, what decent, cost-effective DIY fix would you suggest?
Thanks again in advance.
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