[quote:gmkfuf8t]Thanks for the info Frank.  
It did not make sense that someone had gone to all the trouble of changing both the grill and hood.
In looking through the ytmag's archives, I found a posting by "Sherry" on 9/19/2000 and she states that the 550 switched to the fiberglass grill at the very end of 1962.  Don't know if that posting was from our HPOCA Sherry.
I like your info better - cuz - finding the older hood and grill could get very expensive!!
Thanks,
Barrie[/quote:gmkfuf8t]  Happy I could help.