no part number

Boss 302BOSS 351 Mustang

Confirmed Application. Information has been double checked with at least a second source69-70 BOSS 302 Mustang

Confirmed Application. Information has been double checked with at least a second source71 BOSS 351 Mustang

Aluminum

Boss 302 covers have a BOSS 302 Decal affixed

Boss 351 covers have a Specification label (no decal)

Pics courtesy of Chris

 

Consensus from Boss 302 forum,

Original Boss 302 and Boss 351 covers have Screws holding the spark plug wire loom. NOS or replacements covers have Rivets instead of screws holding the bracket. 

thanks Tim for pointing out this detail