So in other words you have this problem -
I'm trying to recall what I did when I did the fix several years ago which was at a COE campground with basic tools.
With both ends of the bar disconnected roll the bar up, or down your chose, to clear the springs to install the bolt. Then move the bar to line up with the link. Slide the bolt out until the bolt head is against the spring. You might have enough lateral movement of the link and the bolt to work the link back onto the bolt. It may need a bit of persuasion. The other option is to remove the bushing from the link, install it first on the bolt then push the link onto the bushing. Again persuasion might be necessary. A bit of silicone grease will help.
You could unbolt the two axle clamps which will allow more movement or unbolt the top of the links to allow bar movement to bolt the lower ends in.
The other option is long links as Waiter21 suggested. There are many owners that made or had made new links primarily to maintain the design geometry.