DIY resistor pack for car AC blower motor

Rather than blowing a lot of money on shipping a few grams on a part that has a flawed design I could just buy some resistors locally and connect them all together to the pigtail. Only issue is I don't know where to start with appropriate values.

It's a 5 pin set up with B+ and the 4 fan settings, naturally B+ is 12V. Schematics aren't all that helpful as there aren't any values, just block diagrams (cheers GM). Could someone point me towards what would be appropriate where it won't just burn out on arrival?