FE cooling system question

I'm working on a 361 from a 58 Edsel Pacer. There is a piece that the water temperature sending unit threads into that goes beneath the waterneck. Does anyone know if these are a common item that I can get at a parts store? Or is there some place that I would have to order one from?

Thanks

 

napa usally books FE parts but its just a sender to pipe thread just get one and make it work if you can get a factory replacement.

 

I'll be heading to Napa on Wednesday for some other stuff, I'll be sure to ask, thanks man!