Christian - Amazing Grace Chords & Tabs

Just learning and I realy love this song.
But I found that the EM and the following D should be 
replaced by A7 and D7.    

   G            C          G
Amazing Grace, how sweet the sound,
                         D
That saved a wretch like me.
     G                C       G
I once was lost, but now im found,
    A7         D7    G
Was blind, but now I see.
[ Tab from: https://www.guitartabs.cc/tabs/c/christian/amazing_grace_crd_ver_3.html ]
     G                     C        G
Twas grace that thought my heart to fear,
                     D           G   
and grace my fears released. How precious
         C      G      A7            D7  G   
did that grace appear, the  hour I first believed.

 G                           C       G
When we've been there ten thousand years,
 G                     D 
bright shining as the sun,
  G                     C           G
we've no less days to sing god's praise
  G                D          G
than when did when we first begun.

G            C          G
Amazing Grace, how sweet the sound,
                         D 
That saved a wretch like me.
     G                C       G
I once was lost, but now im found,
               D     G
Was blind, but now I see.

This is my first so please let me know.
Thanks