Transmission gasket for my '67?

[Tim Klein <tim@xxxxxxxxxxxxxxxxxxx>]

My '67 has developed a transmission fluid leak.  It's not
a steady stream, but three days in the garage is enough to
produce a "pool of blood" on the floor under the front of
the car.

My mechanic tells me I should bring him a "pan gasket" to
fix it.  But is "a pan gasket for a 1967 Imperial" enough
information for the nice person at the parts store to know
what I need?  I don't know nothin' 'bout fixin' no transmissions,
and their computer systems don't typically go back as far
as '67.

I see the following transmission gaskets listed at
partsamerica.com, all made by Pioneer Products:
    Trans. Gasket: front pump: A904   $2.59
    Trans. Gasket: front pump: A727   $0.99
    Trans. Gasket: extended housing (incl. A727) (incl. A904)  $0.99

Is one of those what I need?  They sure are cheap!

Thanks in advance!

Tim Klein
'67 Crown 4DHT
Rye, New York