Tried to replace Blower motor, but I guess I bought the old style.
It doesn't work because the car needs this:
2 wire(which I could make work)
No nut on end of fan
Less motor hanging below mounting flange
Cooling hole part of mounting flange
I notice the motor on the car says Delco, and has a part number H5049890. Is that a Volvo number?
Does anyone know the replacement Delco number?

I used a blower motor for a '91-'96 GM B-body (full-size RWD i.e. Caprice) car; it is almost an exact replacement. It came with a blower wheel already installed. I had to add a pigtail to the original plug to make it work as the plug receptacle on the motor was a different shape than the Volvo wiring plug. That took about five minutes to fabricate. It was about $50 off the shelf at Advance Auto. A section was added to the FAQs on this based on my findings:

http://www.brickboard.com/FAQ/700-900/HeatingAirConditioning.htm#Replacement_Blower_Motors

If you go this route just don't hook up the wires backwards or it will run in reverse.

'91 744 (newer style two wire blower motor)