Winter tires and rims question

[FortMacGuy]

We live in Northern Canada where it regularly get to -40 with tons of ice so we need winter tires.
I found Nokian Hakkapeliitta LT3 winter tires at a tire retailer near here that are exactly the size of the OEM tires: 315/70 R17 with studs so we're all good for rubber. The tire store mounted up the rubber on new steel wheels complete with TPMS sensors. Unfortunately the store got the wrong sized hub so we can't install the tires on the Bronco
What is the actual hub size required on the steelies? I think 93.1 or larger will work?
Is there a steel rim that will work best, and do I need to be concerned about locking mechanism on the driven side?
What range of backspacing will work?


For information the tire store got 78.1 mm hubs so I don't think I have any options to adapt.
Specifications

Title	Steel Grey 17x8 +24 6x139.7mm 78.1mm
SKU / Part Number	X47139
Price	$146.30
Manufacturer	Steel
Weight (approx.)	32.4 lb
Model	Steel
Bolt Pattern	6x139.7
Center Bore (mm)	78.1
Load Rating	1180 kg / 2600 lb
Finish	Grey
Offset	24.0
Seat Type	Conical
Usage	All Wheels| Winter Approved
Diameter (in)	17.0
Width (in)	8.0

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[Lcubed]

the factory steel wheel has a part number of
KB3Z-1015-D

 

[FortMacGuy]

the factory steel wheel has a part number of
KB3Z-1015-D

Thanks, now I can rest easy knowing the bore I need is 93.1 mm, and there is a Ford P/N option.
Too bad I have to drive 900 km round trip to get this fixed. That's what I get for trusting the kid at the tire store!
I try to shop local but the Nokian dealer in town is notoriously bad to deal with. Slow with crappy staff so I opted for a trip out of town. ugh...

Different question - what are the locator tabs for on the hub? Never seen that before.

 

[Emilian]

How much heavier then OEM tire, non-studded Nokian LT3 is?

I got Motegi MR15078568718 rims. They wight only 23.92.

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