Exhaust Manifolds

[MAC]

A friend of mine is trying to sell me what he believes are rare HP exhaust manifolds for a 440, can someone decode these for me so I can show him they are not what he thinks...
D N N1(5269)
Right 2806800
Left284399-2

Thank You in advance

 

[MAC]

I found a link that showed me what I think I wanted to know, the right side number he gave me wrong but close...
R= Is 2806900...... the left side is correct number
Left side = 2843992
the chart shows these being 1968 - 1969 High Performance manifolds but bot associated with any body line of cars...what car would these have made for?

 

[moparlee]

The book I have shows:
LH 2843992 for 68-69 B body HP 383 and 440
RH 2806900 for 68-69 B & C body HP 383 and 440, and for 67 B & C body HP 440
They are not rare.

 

[Plumcrazy70]

I found a link that showed me what I think I wanted to know, the right side number he gave me wrong but close...
R= Is 2806900...... the left side is correct number
Left side = 2843992
the chart shows these being 1968 - 1969 High Performance manifolds but bot associated with any body line of cars...what car would these have made for?

mymopar.com has casting numbers and dates etc. for motors, intakes, manifolds, heads. Great resource.

 

[MAC]

I had a feeling there was nothing rare about them, that's for the updates guys