You're very welcome. Glad to be of help. Grainger is a good place. I have always found them very helpful. You did it the right way by taking the whole blower along. Dayton is their brand, and it's good. I would not worry about the 3 speed VS the original 4 speed. If you have to swap a wire in the summer for cooling, thats not a big deal. Most likely you wont have to do anything, 3 speeds are plenty. I'm just glad you got heat again.
From reading your other post, I think that furnace place was really trying to rob you. I'd avoid them. An 18 year old gas furnace is not all that old. Gas furnaces are not that complicated, at least not the older ones. You can actually check the heat exchanger yourself by removing the panel and simply looking for any cracks or imperfections. Or find a trustworthy furnace repair company to inspect it for you.
The advice to get a CO alarm is good advice. You saved a lot of money, so go get yourself a CO alarm for about $20. When you inspect your heat exchanger, vacuum out any debris in there with a shop vac. Keeping it clean prolongs everything.
One last thing. I hope you oiled the bearings on the squirrel case blower. If they are tight, that could have added to the motor burning out. Be sure to oil them at least twice a year.
Merry Christmas