Part number stamp on 440+6 air cleaner

[wwheel]

Has anybody seen these stamps on the air cleaner base and lid? I ma pretty sure these are old Mopar Performance parts that came with the '70RR when I bought it years ago. Did these part numbers appear from the factory?

BTW, the base had the shield in front and I cut that off since I have the A/G hood.

Thanks.

 

[R413]

Yes I have one and the mopar performance didn’t have numbers like this. I believe they are over the counter parts from Chrysler not mopar perf. I don’t see this number stamp on originals on the car. What color is the top of the lid?

 

[wwheel]

The color is black under orange paint. These are steel pieces luckily and appear to fit just fine.