Blower motor parts help please!

[Bal70GMC]

Hello all:

I have a 1970 GMC 1500 factory air truck and need to identify part numbers, names and possible place to purchase the following:

1- the short rubber hose that comes off the blower motor and goes to the heater core box. I believe this is called a blower motor cooling/vent tube but can't find a correct part number.

2- the flange and hose nipple that screws to the heater core box that the rubber hose pushes onto. The flange should be roughly oval in shape with 2 screw holes on the outside and about a 1 inch nipple on it for the hose to connect to.
Thanks in advance for any info.