Ok - good photos. Did you fully remove the plastic elbow from the brass pipe or did it come apart on its own? Actually looks like who ever replaced your hose might not have assembled the fitting properly. The parts are standard pipe threads and a workable replacement should be available at Lowes or HD. But this should be fixed by dealer that installed hose as I'd say they botched the job.
Edit: I just looked closer at your photos. That grey elbow part is Schedule 80 PVC. Might not be available at local hardware store, but can be found online.
Here is one that would work from Lowes online. Check your local store for stock.