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Was the old bushing hammered to pieces? About all you can do is take the whole sproing to a spring shop and see if they can tighten the eye, but if it's an old old spring there may be a risk there... They can make a new top leaf, might be a better idea. But the cost of the top leaf may be 50% of the cost of "store bought" whole new spring. And if you replace one side.... See how costs spiral?!
did you try swapping the bushing that fits for the one that is too small and/or measure both bushings and spring eyes with a calipers to see if it is the bushing or the spring eye? Could be simply that the wrong bushing ended up in in the wrong labeled bag, or an oddball spring ended up on your truck.
I don't see what they think that would accomplish. The bushing isn't going anywhere, it's just a sloppy fit. How sloppy is it? Enough to rattle, or just not tight? Usually they are pretty hard to press in.
If the spring eye is actually larger than standard look closely for hairline cracks. Might just cut a tin can into strips and press them in with the bushing if you really want to tighten it up. Like Ross said, it is not going anywhere. Just how much slop is there in the eye? Remember to grease well.
I had a similar issue, old bushings tight new ones loose. I went ahead and used them anyway, the ride was awful. New springs rides likes a Caddy (not quite).
There is enough play that I can push the bushing in and out with no resistance but not so much side to side of that makes sense. The other three went in fine with a press.
The problem with a loose fit in the spring is that the bushing may spin in the spring instead of spinning on the pin. Likely why it's loose, not enough grease at some point. If you can shim it tight, great, if not, maybe live with it until you need springs? It doesn't sound real loose.