rollers for door from 1970s

I'm afraid that I can't identify what you have from these photos. What you're showing me here is just the internal portion of a complete roller assembly. It's missing the outer housing, which is a vital detail. It's probably still installed in your door.

We need to see the whole thing together in order to recommend a match. I specifically need to see it from the back, top, and sides. I will also need written dimensions of the outer housing, width" x height". Once I have that data I will check our inventory to see if a replacement is available.

Sure, I just looked at the photos you submitted. It looks like you have an aluminum door, so you have to remove the bottom rail of the door first. 

Carefully lay the door down on saw horses or a large table, any stable surface really. Unscrew the two bottom frame screws and with a block of wood and hammer carefully knock off the bottom rail from the glass. You have to use gentle, but firm taps. You don't want to break the glass.

Looking at the rail where the glass fits into you will see a machine screw that is holding the top roller assembly to the frame. Remove the screw and slide out the housing out. 

I have to stress that there is a risk that you can break the glass. If you aren't comfortable doing this then you may want to seek the assistance of a local professional so that they can do it for you. 

Once we see the full assembly together, we should be able to recommend a replacement option.

Perfect, thank you! This is precisely what we needed to see. My recommendation based on these photos and measurements is our 81-004. I think this is just the thing you're looking for, but you may want to review our specs just to be sure.

Dimensions for 81-004

Dimensions for 81-004

That should still be okay. These rollers adjust, so you can make up for a difference in wheel size that way. Being 1/4" isn't going to be the end of the world.