You have a 67 housing. The date code indicates the housing was cast on Jan 25,1967. Pontiac went to a 1 inch wider rear for the 67 A Body cars, Chev didn't change to the wider housing untill 68. There's no problem with the ears on the housings, there were some minor differences in the spring perch angles between the GM divisions, but nothing to cause any major problems if exchanging rears. The lower control arms are the same, but begining in 68 the upper control arms are not the same length because of the change to a different frame design . So, use the correct upper control arms and there's no problem. I went through this issue when changing rears in my 65 and 67 GTOs.
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