GPZ550 exhaust compatability

Does anyone know if the 81 GPZ headers will fit '84 GPZ?
The part numbers are different from Kawasaki, but that does not mean that it will NOT fit.
Also,
I noticed that the MAC 4 into1 is the same for 79-83 KZ550 and 84-84 GPZ ( which seems odd since the they really is an 81-83 gpz 550)

so, anybody done this?

Thanks,
Lee

They fit the head. The differences are minor , like attachment points etc.

Even Zx600 headers supposedly fit.

Any thoughts/opinions on this one:
kzrider.com/forum/23-for-sale/604581-81-gpz550-exhaust
I would probably wrap the headers, so not worried about the small dent. But not sure how well I could clean up the silencer.

really wanting to put a 4 into 1 on the bike.

Some race headers require you to remove them, or parts of them, to change the oil filter. That one appears to be that type. Also, the header pipes will need a little tweaking to get them all to line up (#1 appears out of line).