Universal Rundle & Sears, help to identify old wall mounted tub faucet

Hi I'm looking to replace this faucet that came with my house because the hot handle is starting to leak ,so I bought a new diverter faucet and I took off this old one in the picture ,their is a three hole valve in that metal cover that screws to the water line in the wall so I took the valve off in the cover and tried to screw the new one to the water connecter but its too small ,so i thought maybe i could go to the hardware store and ether get a different faucet or get new stems they said I have a old union hook up and I'm never going to find a faucet to replace it or the stems to fix it the guy at the pluming supply house told me he cant tell who made it and there is no way to hook up a new one to the union connector so I had to re hook up this contraption because I don't know how to get a new one that fits ,Is there a faucet that fits a union connector ? is there a adapter ? Any help would we appreciated thanks.
Jeff

 

Your faucet was distributed by Sears Roebuck. The wall unions will screw off leaving you with 1/2" nipples. The new faucet in your photo will work if it can be set at 6" centers. I located one from a online store for you to look at.

https://www.noelsplumbingsupply.com...xposed-tub-faucet-for-universal-rundle-sears/

 

Thank you for your reply ,If I get the one in the link do I still have to remove the wall Unions ? Because I tried to remove them and because they're so old they wont turn even .And would the spout be threaded for a shower sprayer hose like mine has ? Thanks
Jjeff

 

The unions should match up no problem. As for the the hand shower, it was installed at a later date after manufacture. I can't see the threading but if someone else installed it you should be able to as well.

 

thank you for your help Marlinman