Premium intake/exhaust gasket.  The best quality available anywhere! Trouble free.
Included in our premium gasket sets too.
 
As is so typical, introduction of this gasket prompted a panic sale at DP.com to sell off their low cost/high profit product.   LOL
 
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!
 
If you still want a cheap header gasket, we have DP equivalent gaskets here:
 
https://www.datsunrestorationproducts.com/product-page/low-cost-header-gasket-u20-2l