Q: Our 1996 Atro Van AWD had the idler arms replaced. They used the wrong parts. on 1996 Chevrolet Astro

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They have since replaced them with the rightones. It was aligned but the steering pulls to the left. Now they are sying the steering box is going. Could rplacing with the in correct parts the first time have caused this issue. There was no problem with the steering prior to them using the wrong parts.
(1) Answer
Get another opnion and estimate to take back to the shop that did the work if a different problem is found like something they did caused this trouble!