Rather trying to explain the difference I am posting a past thread that should help you with your inquiry. HRP https://www.jalopyjournal.com/forum/threads/g28t-german-four-banger.181976/
G = German. Really hard to find also in Europe. I had one in a 32 Panel delivery. Engine was dated 1943 ! Hennie
Search the archives here and on fordbarn.com. Also search Google. As far as one being available, I seem to see one for sale somewhere in the world every couple of years. I don't think I would plan on finding one but you might get lucky. Charlie Stephens
Many are running G28T engine. They are pricey.. A good one fetches 6000 $ Sent from my SM-G930F using The H.A.M.B. mobile app
Here is one for sale, https://www.fordbarn.com/forum/showthread.php?t=234189 The guy only has one post which says SCAM to me, be careful. Charlie Stephens