Trying to identify some factory A/C - heater boxes - need some help - Please?

[gtx6970]

I need some help. I have 3 A/C boxes in the loft.

one is marked MODEL 955 - this one I am reasonably sure is 66-67 B-body

2nd one is marked MODEL 959 - supposed to be B-body when I bought them
something tells me this is C-body.

last one is marked 2877_44 ?? (  not 100% sure of the 8 is in fact an 8 and I can't make out the missing digit ) , and it has a 1957 below that which I believe is the date code on the bottom of the case half.

All are / were supposed to B-body A/C boxes


Any owners with unrestored factory A/C boxes wanna ck yours? Please? All years and models  from 1966 up thru 1970

Every one I have the Yellow print is stamped on the end right above where the gas pedal would be

by my research the B-body boxes -
1969 Box is 2936466
1970 Box is 2936892

[Just 6T9 CHGR]

I will check what I have in my car & the spare in the shed in a few....