Automotive blowers are almost always made as OEM jobs for specific makes/models of cars. They're not something that you'll typically find sitting on a shelf down at the local auto parts outlet store.
My blower is about 15cm in diameter, and 33cm long with the two cages. I have two heater-cores hooked up in flow-series sitting beside each other in my radiator box, effectively acting as a single large 4-pass 22cm x 28cm surface area radiator.
Now to buy the dual-cage blower new, in Australia, is around the $150US mark. I picked up mine second hand sitting on a shelf for $70US, and then sadly had to spend another $70 four weeks later to replace the motor which was basically screwed, which is probably why it was just sitting on a shelf. The new motor is fantastic and has been running for about 3 months non-stop at 7V low-speed setting, but I digress.
I think I was just unlucky with the motor. When I pulled it apart it was basically fine, just rusted in a few spots that eventually led to it wearing away at its bearings, probably as a result of sitting on a damp shelf for 6 years.
Where I'm going with this is that it's probably easiest to just go to a car wreckers and yank a blower out of a late model wreck. It won't have seen much use, the motor won't have had time to rust, and you'll probably be able to pick it up for $40US or so, plus some effort.
As for specs and dimensions, the best place to start would be with a radiator repair centre, such as a Natrad outlet store, and ask to browse through the heater-core blower catalog. Then you can pick out the blower model that you think you want, find out what cars that it lives in, and then go to a wreckers with a mission.
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