This is a manifold gasket that will only work with the stock 1600 exhaust manifold (center ports joined).  These do NOT work with after market headers.
 
Great price!
 
Since we work on so many roadsters, we know that changing the header gasket is a pain and suggest using the best gasket you can buy!  We have used EVERY type!
 
We suggest these instead:
 
https://www.datsunrestorationproducts.com/product-page/exhaust-manifold-gasket-1600-1500