I have a NOS heater core that will supposedly fit a 56 F100.
I bought it to replace the one in my 56, but the tubes on the
core are bent different. Mine has one straight tube and one angled
tube. The NOS has two angled tubes. Does someone recognize
this core and what type of heater it may fit. Mid-fifties catalog
states there are four varieties of cores, of which this is one,
(MF part # 1935-D). Since I can't use,I would like to sell, but
want to state the ad correctly, so some does not buy it like me
and find out it is wrong for them. If you can help I would appreciate
it. Here are pics below.

 

not sure, number dummy might help with the older numbers to see what it will fit, but till then i'll bump it up to let someone else give it a shot.

 

My Parts CD lists that number as a 1956 Fresh Air heater core for virtually every '56 model except school buses. The Illustrations CD doesn't really show it in any detail.

Was the box sealed?

 

Thanks. No the box was not sealed, so it could have been
possibly switched. My 56 has a recirculating heater, so as
stated it has a straight top tube and an angled bottom tube.
My 53 has a fresh air heater but also has a heater core with
the same tube arrangement as the 56 recirculating heater.
Maybe someone with a 56 fresh air heater can check theirs.
If you reach behind the right side of your heater you can feel
the tubes in the back very easily to tell what they are.