New aftermarket thermostat  4-bolt top plate with new gaskets and new cap.
 
4-bolt fitment as shown (late 67-70 R16 only)!
 
These plates use a readily available (any parts store) miniature japanese radiator cap rather than the more expensive oem style cap.
 
A nice, economical replacement.  All new!
 
Choose black powder coat or  primer DIY finish.