Brandon, check the front panel in the cook box where the burner tubes go through the cook box. Make sure there is not rust/corrosion around those holes. If so, that panel will need to be replaced soon and they are no longer available. I just don't want to see you sink a lot of money into the grill to find out is basically unusable.
Also, finding a donor grill for the Propane manifold is probably your best option. You could try Weber C/S but I am not sure they would even sell you one. After market sites might sell them, but they will be pricey. With luck, maybe some here will have one to trade or sell you.
Good luck.