Bumpers...year...make....ideas???

Picked up these 2 bumper yesterday...one has GM MB on the back..the other ??...does anyone have an idea what these belong to..

 

Forgot to mention...the first one is the one marked with GM MB..

 

the one with the bumperettes looks likkke my '37 Chev, the indented one may be a 37 from a 'vert, they were bent that way, also they were used on other models, guessing sedan delivery...

 

The bumper with the black strip looks like a 40 chevy. Do the bumper brackets have markings?

 

It´s just pice of ****.
Give it to me........................