Purchased a 1983 Pontic Firebird TransAm

[renchero]

should it have vented discs on the back?

 

[TransAmDan]

should it have vented discs on the back?

Good question and I wondered that myself last night.
Looking up rear discs on Rockauto they do seem to be vented. It does give me a thickness of 26mn so I can check that with what I have, perhaps wrong ones are in there.