Previous gen Echo shocks on current gen Yaris

[Loren]

Photos would be helpful here. But, I'm not hearing anything that would make it impossible to fit.

In the rear, you say that the Echo uses a larger lower bolt. That can be easily fixed with a bushing to fit the smaller Yaris bolt to the Echo shock.

In the front, use the Yaris upper mount. If the shock shaft diameter is larger, can the upper mount hole be enlarged to fit it?

The front lower mounts, as long as they fit around the hub assemblies, shouldn't be a problem. Fix the too-wide bolt spacing by redrilling the lower hole.

Unless I'm missing something, it sounds doable with some very minor modifications.