Need help to I.D. bumper end

O.K.- I've had this bumper end in my garage for 25 plus years & it's time to I.D. it & p*** it on to someone that can use it . I've always thought it may be middle 50's GM ? But what does it belong on? Thanks for any input ! danzee

 

Left front '56 Pontiac.

 

This is what I've thought all along, but I had a few guys tell me I was wrong .I just did a search & found these pics of 56's . Looks like you nailed it !THANKS!!
danzee