2.5d wont bolt up

[VintageMA]

I'm looking at those two motors and I am wondering a few things:

1 - How old are those motors?

2 - They look like two totally different motors - are they both 15xx series?

3 - It is obvious just from the picture that they have two different screw patterns. The one on the left that fits two screws (usually only 2 screws will mount up on a car mount) is probably a standard 25mm screw pattern, but the one right looks like it has both a smaller screw pattern and also a smaller overall diameter - is it a 15xx series or a 11xx series Neu?