https://www.ebay.com/itm/Datsun-1973-240Z-6cyl-Engine-long-exhaust-US-Genuine-Datsun-OEM-1-Manifold-E30/303027786028?hash=item468ddd112c:g:oxAAAOSwvD5aH9tl:rk:4:pf:0&vxp=mtr

 What the hell?! Am I missing something besides a boat load of these?

And its not for a 1973.  It's for a 1970 -1972.  1973 is an N36 manifold

Whoa!  I better do some digging...

 

Wow, that seems crazy.  Yesterday, I had to pull my manifold as one of the air tubes rusted through.  Time to cut them off and weld shut.  Not even going to try and remove them.