Technical Can you identify these Buick grilles?

Can any of you tell me what year and any other info you have on these two Buick grilles? Id like to put some ads in the classifieds, one WTB, one for sale. I think the top is 51 or 52. The teeth are chrome, not stainless like the set I already have. Probably selling this one for pretty cheap if anyone is interested!
The bottom I think is 52 or 53. I need more of these teeth for a custom grille I'm building. Anybody have some for sale for not a whole lot? I can knock out dents and shine them up so perfect condition isn't too critical.

Below are some closer pics of the one on the bottom shelf:



These are closer shots of the one on the top shelf:


Thanks in advance!
Johnny

 

My dad had a '52 and it had stainless bars that looked like the bottom one. I also know that '51 used a different grille even though they look so similar, it might be a '51 above and a '52 below.

 

Thanks Squablow! Anybody have a definite so I can list/search accurately?